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barrowroad

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  1. barrowroad
    I set up the full layout in preparation for a visit by the Glevum Group earlier this week and took the opportunity to position the box on the layout - I have since decided it is not in the correct positon - to take some photos.
     
    In the photos the roof now has all but the final couple of layers of tiles, but these have since been added. The finials are from MSE and the two chimney stove pipes are from brass tube. Following a discussion at the meeting about the ridge of the roof and a subsequent site visit to the old Warmley Signal Box, near Bristol, I decided the box does not have ridge tiles. The 'ridge tiles' are in fact normal tiles which are closely 'butted' together and must have had some form of sealant underneath to prevent to ingress of water. These have been added and the roof is ready from priming.
     
    Further observation of my photos revealed the box nameboards have 'white' paint around the perimeter and so I have removed the the red paint.
     
    After some discussion with the Captain and Mr Venton - the two Tim's - I now have sufficient information to make and position the 45 lever frame inside the box. Closer examination of photos od the box reveals the frame was positioned at the rear of the box which enabled the signalman to have unfettered access to the front windows for sighting purposes. It is possible the original frame was at the front and was repositioned around 1936 when a new frame was installed.
    I am awaiting a delivery from Masokits to add the remaining two packs of levers to the three already in my possession [10 per pack] and then I can make up the frame and levers. The frame will need some modification to represent the Midland style 'barrel frame'. I'm looking forward to this task as it will make a change from white roof tiles....... the white coat and padded cell beckoned
     
    I'm in the process of resizing the photos I took at the tuesday meeting and will post them shortly but if you are desperate Paul has added some on his P4 Workbench thread Kempenfelts P4 Workbench .....nice one Paul.
     







  2. barrowroad
    I purchased a Proxxon Cut off saw a few weeks ago to enable accurate cutting of the brass and nickel silver sections required for the roof girders and eventually the roof trusses [ the likely follow on project after the girders ].
     
    I did send the first one back after discovering a problem with the on/off switch - it tripped the RCD each time I switched it off! The replacement appears to be alright and I have used it to produce all the diagonals for the lattice girder with pleasing results.
     

     
    The close up shows the addition of the 3 wider 'T' sections nearest to the end of the girder and the narrower ones towards the centre.
     

     
    Each diagonal is positoned with a dab of Carrs 179 solder and fixed in place using an RSU.
     

     
    After completing both sides here is the finished girder - rivet overlay still to be fitted.
     
    These photos clearly show the three layers of the lattice making up the girder.
     

     

     
     
    The finished product has proved the method of constuction for me and I shall now proceed to make up the remaining sections.
  3. barrowroad
    In my last blog entry - was it really two weeks ago - I mentioned I had started to give some thought to the roof girders which support the two inner pitches of the roundhouse roof.
    The three pitched roundhouse roof has four supports - the outer walls form two - the other two are 4' high latticed girders each supported by four cast iron octagonal columns, situated under the two troughs of the roof .
    I obtained these columns from Colin Seymour - Alan Gibson - as left over stock from the EM Bath Green Park project that Alan was involved with - they are cast in whitemetal.
     
    Having now obtained sufficient stocks of brass and nickel silver section - courtesy of Eileens & Metalsmith Ltd - I decided today to make a start.
     
    Here is my scale drawing of one of the 46' lattice girders, six of which are required for the two girders together with four shorter ones each 18'6" long.
     

     
    The top and bottom of each lattice girder is formed from pieces of 'T' section - 5mm x 3mm - obtained from Metalsmiths. This special section is milled and includes a 0.5mm channel down the centre which I have used to insert and solder lengths of 2mm x 0.5mm nickel silver strip - Eileens.
     
    The 4 verticals were cut first and soldered into the bottom 'T' followed by twelve diagonals from the same material.
     

     

     

     

     
    Finally a piece of 5mm x 0.5mm nickel silver has been soldered at each end to form the vertical 'T' section.
     

     
    The next job is to cut the twelve pieces of 2.5 x 1.5mm 'T' section brass to form the outer diagonals at the two ends [ they are 7.5" wide] and 2mm x 1.5mm 'T' section for the twelve inner diagonals [ 6" wide ] and solder them in place. To complete each girder a rivetted overlay - top and bottom will need to be formed and added.
  4. barrowroad
    For those of you who might be wondering about the lack of any post for the past couple of weeks the answer is I am on an enforced break from modelling due to the need to redecorate two rooms in the house
     
    It's not all decorating as I have found some time to investigate how I am going to make replacements for the mdf roof trusses as supplied by York modelmaking, not that there is anything wrong with their laser cut items, it's just that I have decided the roof will need to be removable in order to access locos and the shed interior for any future repair work.
     
    Becase of the 'strength' requirement I have decided to form the roof trusses from various pieces of brass section and rod and am awaiting delivery of an order from Metalsmith Ltd of Telford. I have also ordered some 'T' section brass from them to form the top and bottom of the distinctive girders which form the main roof supports.
     
    As there are 39 roof trusses in the roundhouse alone the first thing I will need to make is a template to solder all the brasswork together in an accurate an consistent manner.
     
    I have been added as an author on the new Showcase site - I am honoured - and may decide to post the next phase of the build there. I'm undecided at the moment.
  5. barrowroad
    With the walkways now complete and painted - a coat of Halfords white primer with the planks given a wash of Humbrol 53+62 - the time has come to fix them, the steps and the firebuckets to the box.
     
    I decided to fix the walkways to their support brackets using a thin coat of araldite so that removal for any repair at a future date is possible. Here are a selection of photos of the completed signal box - I hope you like the result - I certainly do.
     










  6. barrowroad
    Before getting on to the construction of the walkways here are a few photos of the 'stench pipe' fabricated from 1.5mm brass tube bent to a suitable shape with the connection to the loo added for good measure!!



     
    After much thought I decided to make the walkways from nickel silver strip and wire in order to give it a degree of strength and to minimise any accidental damage.
    Looking at the set of drawings of the 20ft box in Midland Record No 2 there is a good drawing of the handrail clamps which attach them to the uprights.
    Using a short length 1mm x 0.2mm nickel silver strip I made a 180deg bend around a 0.45mm thick piece of brass strip using flat nosed pliers. A length of .3mm wire is then placed into the formed 'U' and squeezed onto the wire [ tight fit but still moveable] followed by pinching the two tails of the 1mm strip together with the pliers. A hole - 0.45mm - is then carefully drilled through both the tails and then opened out to 0.55mm to take a brass lace pin. This gives a good representation of the clamp.
    My box needed 28 clamps
     
    Here are a few threaded onto a length of 0.3 wire - they have a tendency to fly away - this keeps them all in one place until use.

     
    The two walkway boards are 7in x 2in on the prototype so I used 2mm x 0.5mm nickel strip to represent them. Pieces of 1mm x 0.2mm strip are used to form the support for the verticals. A 0.45mm hole is hand drilled into one end and opened out to take a lace pin soldered into place using Carrs solder cream. Each strip and pin is then soldered onto the underside of the two walkway pieces [ An RSU was used for this operation]. This is repeated for the appropriate number of supports. Once the required number have been fitted - 12 in the case of the front - the clamps are slotted over the lace pins which are then cut to the correct height. [it is easier to place the clamps over the pointed end of the pin]. A length of 0.3mm wire is threaded through each of the clamps and a home made height gauge used to position the clamps and wire at the correct height.


     
    Finally this is the result.

     
    I have reached the point where a trial fit is required and this shows the benefit of having a removable roof. The walkway has been assembled into a number of sections in order to ease fitting. The largest is the unit consisting of the front/steps and rear half shown above. This drops over the top of the box and sits onto the walkway supports already positioned on the box. The short rear section is seperate and needs to be glued into position after painting. A further 'L' shaped walkway forms the final piece at the left rear of the box.
     
    Here are a few photos;


     
    Finally here is a 'night shot' tken before the walkways were started - I just like it.
     

  7. barrowroad
    Here are a few pics of the drain downpipes before painting. They are fabricated from 1mm brass tube with split pins soldered at appropriate points to represent the joints and fixings.





     
    Photos of the stench pipe to follow.
     
    I have revisited my copy of Midland Record No2 and have now found a way of representing the handrail clamps on the walkway so my next task is to make up the signal box walkways from nickel silver strip, brass pins and 0.3mm wire.
  8. barrowroad
    The PCB board inserted into the roof is courtesy of my S4 Glevum Group colleague Dave the groups electronics guru - thanks Dave.
     
    As mentioned in a previous post I ran out of LEDs and sent for a pack of 3mm Protowhite [Golden Light] from Bromsgove Models. I also decided to try out one of their DCC Concepts LED/Lamp Control boards.
    Two of the new LEDs have been fitted to Dave's circuit board without the 'flourescent tube' and a further LED has been fashioned into the exterior gas lamp at the corner of the box at the steps end. I had two attempts at making this light eventually settling on fabricating the structure from turned up pieces of plasticard.
    The cathode of the LED was cut back and the anode shaped into the swan neck gas pipe to the lamp. A length of enamelled wire [ from a spare electromagnet] was soldered to the the cathode and then wound around the swan neck so that both terminals entered the box at the top left of the steps end panel of the signal box. The anode is a push fit into a piece of 1mm brass tube which acts as an electrical pick up from the copper tape on the roof. The enamel wire is routed down a piece of 1mm tube to the underside of the box to connect with the two sprung plunger pick ups via the copper tape on the underside of the roof. This way the roof is removable.
     
    The DCC LED Control board has been fixed to the underside of the box floor.

     
    Here are some night shots of the box with the lighting on - powered by a 9V batttery.





     
    I have just fashioned two downpipes from the guttering one to fit at the right corner of the front elevation and the other to the left corner at the toilet end of the box. There is also the stench pipe etc from the toilet itself to fabricate..... photos will be posted in due course.
  9. barrowroad
    Following my recent posting I received two constructive comments from RMwebbers.
     
    I forgot the box stands on a concrete plinth and that there should be steel RSJ's to support the 2 central pillars above the lead out slot. This has now been rectified by adding a layer of 60thou plasticard around the base with the top edge champered. I have just made the pair of transverse 'I' beams to go under central pillars - not fixed yet so not in the attached photos. Thanks for your comments Keith.
     
    Another piece of 60thou now forms a sub base to give support to the steps.
     
    The last set of photos showed some of the roof slates were not lying flat and had lifted at their leading edge. I have now added further glue under the errant slates [not tiles] in order to rectify the problem.
    Thanks to Mark for all your constructive comments.
     




  10. barrowroad
    The box furniture has now been added and includes the booking-in desk, cupboard, stools, chair, clock and finally the two stoves.
     
    The latter have been modified to act as electrical pick-ups for the lighting, Each stove has a sprung pick up added to the top of the stove pipe which makes electrical contact with copper tape attached to the underside of the roof.
     

     
    This needs to be tidied up - one of the LEDs in the tube does not work and I have now obtained fresh supplies from Bromsgrove Models together with a DCC Concepts light control pack. Thanks for the prompt delivery John.
     
    There are two LEDs in the roof which, at present, are positioned inside a drinking straw to diffuse the light [ rather like a flourescent tube - yes I know they were not used in the box ]. I will see what light they produce and if necessary I can remove the tube to give individual lights.
    The control panel will be fixed into the void underneath the box floor and will control the two interior lights and a 'swan neck lamp' at the right corner of the box near the steps. I have spent some time attempting to fabricate this lamp using an LED but am not satisfied with the result so will try another design.
     
    The next photos show the interior and you can see the sprung pick ups at the top of the stove pipes.




     
    The front elevation has also been fixed in position and required a bit of fettling at the corners followed by a repaint of the red. Looking at the next photos I see I will need to clean up some of the painting which looks a bit lumpy in places.
     



     
    The roof has been painted along with the guttering. Painting in between the tiles proved interesting and required viewing from all angles to ensure all 'white undercoat' was painted.







     
    The next task is to fix the lighting, followed by the to downpipes from the guttering. This leaves just the raised walkway and handrails to finish the job.
  11. barrowroad
    Having finished the lever frame and instrument shelf I decided to start the assembly of the box side panels. So far I have glued the rear and two ends to each other and to the mdf sub base and left the front off in order to fix the interior detailing.
    Apparently the floor covering in most Midland signal boxes is linoleum so I cut a piece of 5 thou plasticard and painted it 'lino colour' before fixing the instrument shelf and lever frame in position at the rear of the box.
    The two stoves [unfinished] have been prepositioned with a piece of brass tube [the stove chimney] also passing through a hole in the floor in order to provide a conduit for wiring two grain of wheat bulbs to provide internal lighting - well that is my plan, I'll just have to see if it works!
    Looking at the floor plan I now have to decide a suitable position for the log book desk, clock, cupboard and chair. As the lever frame is at the rear of the box there is no vertical surface without glazing so this should prove interesting. My close up photos of the box are not helpful in this respect.
    Here are some photos of progress so far.




     
    Some minor sanding of the panel corners was required to give a smooth flush finished - this now requires repainting and the last photo shows the ends primed for this.
  12. barrowroad
    The lever frame is now painted and is ready to go into the box as is the Instrument Shelf complete with the Block Instruments and Bells.
    Painting the levers was relatively straight forward although I must admit the chevrons on levers 14 & 15 - the Down Main and Up Main Detonators - took a steady hand with the black chevrons added using a 0.25 rotring pen. Levers 19,29 and 22 are also all Facing point locks and consequently are painted black [bottom] and blue [top].
     



     
    Adding the red and green to the block instruments was not as successful as I had hoped as the narrow nibbed pens used bled and required some cleaning up afterwards.
     


     
    Now all I need to do is adapt the white metal castings for 2 stoves, booking in shelf and stool, notice board, chair and clock.
    I have decided to add some lighting and will use the brass stove flue pipes for the power supply.
  13. barrowroad
    Just finished scratch building the Block Instruments, Bells, Telephones, Repeaters etc and fixed them to the shelf along with the Signal Diagram display panel - the latter will have a photoshopped diagram added after painting. I now have a Springside kit of whitemetal parts to sell after deciding they were not suitable.
     
    In all a very fiddly job but the results are very satisfying.
     
    The Block Instruments are made from 2.5mm square brass section with square section plasticard inserted into the tube, whilst the bells are turned up old 'Romford crankpins'.
     
    The Instruments to the right are for communication between Kingswood Junction and Engine Shed Sidings, whilst to the left we have St Philips & Barrow Lane boxes.
     





  14. barrowroad
    All 47 levers are now in position so here are a few photos:-
     


     
    This one shows the frame in position inside the box - trial fit only at this stage.
     

     
    The instrument shelf has been fabricated from nickel silver strip. the shelf is laminated from pieces of 3/4 & 5mm x 0.3mm strip whilst the supports are made up in a jig from 1mm x 0.3mm strip. The round part is formed from modified High Level 2mm CSB etches... the only thing of appropriate size I could find in my metal stock.
     


     
    I am in the process of making the block instruments, signal diagram display etc to populate the shelf....watch this space.
  15. barrowroad
    I have had a quiet week on the modelling front due to son number 2 going for a job interview and the mother in law going into hospital..................................
     
    However on the positive side I now have a copy of George Pryers book 'Signal Box Diagrams of the LMS - Bristol Area' which gives details of Lawrence Hill Junction Signal Box for 1950. The book confirms that the frame is at the back of the box and that a M R tappet frame with 6" centres was installed in 1938. It also shows there were 47 rather than 45 levers at this time. Thanks Alex [stumytrain] for all this useful information. Alex has a very useful website which I can recommend for data on Bristol.
     
    Alextrack
     
    I have three sets of Masokits lever and frame etches and have two more on order - hopefully to arrive in the next few days - so armed with this new information I made a start on the Midland tappet frame for the box.
    Now the Masokits kit is not for a MR frame and is in need of some modification but the top of the frame is too good to throw away and besides the spacing is conveniently at 6". The problem is it is 9mm wide rather than the 6mm needed.
     
    To adapt the kit I decided to roll the upper etch to form a tighter curve and then add the cover plates for the interlocking using 6mm nickel silver strip - not yet fitted - see below.
     
    So far I have formed the interlocking channel at the rear of the frame using U Channel brass - L section brass & nickel silver strip with pleasing results. I haven't scribed the 6mm top strip yet - top represent the 6" inspection covers - as someone has borrowed my scriber [ you know who you are].
     
    The etched levers are wonderful - the two halves fold together to form the lever by carefully soldering the edges - and can be positioned in the on or off positions by soldering at tab into the base of the frame etch. The levers are too long for the M R frame but I raised the top of the frame by 3mm to give the extra height required - doing this effectively shortened the levers to the correct length.
     
    Armed with the information about the levers I was able to position 10 levers into the frame as follows:-
     
    29,30,37,39,42,43 [ Engine from shed to Up Main - towards Mangotsfield or Westerleigh]
    24,31,32,33 [ Down train for Temple Meads]
     
    So please Mr Masokits can I have the remaining 2 kits and I can finish the job.
     
    The Masokits Etch:-

    Three kits joined:-

    New Nickel silver sides added:-

    Rolled top added to base & U channel added for 47 lever length:-

    Interlocking channel added from brass and nickel silver:-

    10 levers added - see above:-

     
    I will add the promised layout shots over the next few days.
  16. barrowroad
    The kit of parts from York Modelmaking included a set of their self adhesive tiles of the type I used on the shed sand dryer and office complex. I could have used them again on the box but using at the available photos to measure the size of the prototype tiles I found they were 9 or 10in wide, whereas the self adhesive version are a scale 12in.
    I decided to use my tried and tested method using 5thou plasticard and set about making a plasticard jig to assist cutting individual tiles to a consistent length. This jig is shown in the first photos below and consists of two pieces of plastic strip glued 3mm apart onto a piece of 30thou plasticard. Strips of 5thou of 3mm width are placed into the jig and cut into 4mm lengths to give a supply for the roof. Using a bottle of Plastiweld and a very thin brush the task of tiling got underway. It is essential not to overload the brush as the tiles need the minimum to fix them into position. I am pleased with the results.
    One of the benefits of using individual tiles is the ability to carefully position them to include 'slipped' and broken tiles. An further benefit with the signal box is the ability to accurately position tiles at the ends of the hipped roof. The adjoining tiles need to be accurately positioned with a thin gap between them and this would have been more difficult using 'strips' of plasticard or the self adhesive tiles.
    So far I have managed to complete six rows of tiles so about half way there now......... a night on the tiles to finish them - I don't think so, it is News Years Eve after all.
     
    Wishing all readers of this blog an excellent New Year and will sign off the old one with a few pics....





  17. barrowroad
    Some pre-formed guttering arrived from Eileen's Emporium yesterday so I decided to sort out the the roof. This guttering is very good and having filed down tube for the loco shed on my Sheep Pasture layout I don't mind taking short cuts this time.
    Having initally fixed the fascia board using 2.5mm x 1mm plasticard I decided it was oversize and removed it, replacing it with 2mm x 2mm brass L angle strip. This is more acceptable and nearer to scale. The top edge of each of the 4 pieces of fascia was cut at 45deg and soldered together to form a rectangle around the roof. Three sides were made up on the bench, fitted around the roof and then the final forth piece soldered into place.
     

     
    The brass guttering was made up in a similar fashion before spot soldering it to the L angle. Two 0.5mm pieces of brass tube were fixed into drilled holes to give fixing points for the 2 downpipes at a later stage.



     
    The box appears to have two stoves to keep the signalmen warm - hence there are two stovepipe chimneys in the roof. After I scaled the size from two photos I fabricated them from 2mm brass tube plus a drilled out piece of larger tube.

     
    Finally the roof has been measured up for the tiles and my home made jig prepared for cutting the 5thou plasticard tiles......the next job.

     
    A Merry Christmas to all readers of my blog.... I may take a break in the festivities and start the tiles.... then again......
  18. barrowroad
    I have spent most of the day painting the second coat on the four elevations of the signal box - a bit fiddly in places as there are three main colours and rather a lot of 'colour joints' which required a lot of tidying to achieve a reasonable finish. I have also painted the floor a linoleum colour and the interior white. On reflection I think the lower wood panels of the interior should be a dark brown - can anyone confirm this?
     
    The box nameplates are particularly pleasing being laser etched by Chris of York Modelmaking - an order for the shed STOP board has just been placed. These were given a base coat of red oxide primer followed by a coat of humbrol acrylic red/crimson
    . The paint was then carefully scraped off to reveal the Lawrencce Hill Junc lettering.Here are some photos of the results.



     
    I shall be modelling the interior and have 45 etched levers from Masokits to assemble together with various items from the Dart Castings range for the remainder of the interior fixtures.
     
    Now for the roof tiles..............................
  19. barrowroad
    Further progress has been made with the signal box over the past few days with the steps now completed and painted. I had to do a few modifications to the handrails and the platform as my drawing did not match the latest prototype photos.



     
    The roof shell has been fitted with it's Rowmark plastic to form the surface onto which the tiles will be added. I am toying with the idea of using individual tiles cut from 5thou plasticard. I have used this method on the stationary winding house of Sheep Pasture with some success so will probably repeat the exercise on this box.


     
    With the sides all now assembled I decided it was time for a test fit, so here are some photos. Please remember the panels are not glued at this stage and therefore there are some gaps at the joints.





     
    I have been experimenting with some Humbrol Paints and have made a start on the panels - Here is a taster......

     
    that's your lot for now....more will follow.
  20. barrowroad
    As mentioned in my earlier blog I now have a Bachmann 7F 53809 to add to the locos available for the shed. Of course it will now take it's place in the queue for conversion to P4 but for now here are some photos taken on shed the other night.
     
    I wonder if Ultrascale will do a wheel conversion set.
     








     
    I should have removed the Bachmann couplings - sorry.
  21. barrowroad
    Since compiling the set of drawings for the box guess what - yes I have found a better photo of the front of the box and yes there are a few differences.
    First the lower windows are higher up and second the toilet is bigger - must have had large signalmen Thanks to Paul for pointing this out as it's better to know before rather than after.
    The new toilet is scratch built using the internal formers provided by York Modelmaking.
    A few hours work and the modifications are now complete with a redesigned front and a new shaped toilet..... I'm flushed with success
     
    I have also completed the rear elevation.
     

     

     

     

     

     

     
    My Bachmann 7F has been delivered - 53809 - what a lovely model.......watch out for some photos on shed.
  22. barrowroad
    After a call out this morning to sort out my son's car, I managed to do some more on the box this afternoon.
     
    Both ends are now assembled and have been test fitted against the front elevation. The corners interlock very well with the front elevation and are a stepped design to form an overlap with the four laminated layers of each piece.
     




     
    Next the rear elevation......
  23. barrowroad
    At long last I have completed building all of the various pits; those inside the roundhouse, the engine sidings, the preparation pits and the ash disposal pits, a grand total of 33 not including those inside the workshop.
     
    The brasswork of the ash disposal pits has now been sprayed with halfords grey primer which makes it possible to photograph them without the glare from the metallic surface. I have added a number of track rivits to the surface of the brass especially near the board joints in order to give a secure attachment for the track at these positions.
    The final task before track laying is to spray the other outside pits with primer and the weather them. I will prime them in the morning.
     
    Here are some photos taken this evening. You can see the position of the Barrow Road arches which cross over the shed end of both ash pits.





     
    Now I must take a look at the signal box!
  24. barrowroad
    I have been unable to attach any photos to my blog for the past few days - hence the lack of any recent update. It appears to have reverted to the original attachment format so I shall take the opportunity to add some photos of the latest progress.



     
    These photos show my chosen method of fixing the panels to the top surface of the pit walls using brass screws. I am pleased with the result.
     


     
    Here are a few shots of the panels in position in relation to the shed building.


     
    I now have just two panels to make in order to complete both ash disposal pits. Once all are in place I intend to solder a number of track rivits into the top surface at the board joints to give additional strength to the trackwork at these vunerable positions. P4 Track Company L1 Bridge Chairs and M1 Small Chairs will be used together with the rivits to fix the track onto the panels after which the brasswork will need to be painted.
  25. barrowroad
    Time for an update on the slow progress with the two ash disposal pits. Unlike the other outside pits, which were all updated and in some cases elongated using concrete, these two pits remained with their original brick structure and 5ft cast iron panels to support the track.
     
    Having made 7 of the 10 lengths of iron panels [ fabricated from brass section] I decided I needed a break and started on the pits themselves. The pit under the ash plant itself is 220ft long and is curved. The shorter pit alongside is 130ft and is also curved. This fact meant I could not used my straight jig to glue and assemble the pits. Instead I had to fabricate each pit by cutting the pit bases into a series of short straight sections in order to form the curve. After this the side walls were glued to follow the curve.
     
    I have yet to attach the cast iron [brass] panels to the top of the pit walls - a bit more work is required before this happens - but plan to fix them using 1mm brass screws fixed into pre drilled holes in the side walls of the pit.
     





     
    A few additional photos:-




     
    In order to fix the brass cast iron panels to the top of the pit side walls I have decided to use 16mm long 12BA cheese head screws which I have to hand. These will be self tapped into the mdf side walls and have the advantage that they can also be used as electrical connectors as they protrude through the bottom of the pit.
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