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To me what I am seeing as a spare part the OP says is x9749 is looks to my eyes as x9743. The way to be definitive of course is to fit them, and they shouldn't come over the top of the screw.

Thats my whole point. I believe The ones on the model are wrong, and the spare set supplied are also wrong for this wheel. Think about it. there is a reason why they are falling off…. its either the wheels, or the rods&pin, there really isnt any other possibilities here. but look at the pictures I supplied. https://www.hornbyinternationaluk.co.uk/?button=moreinfo&qty=31455&moreinfo=Coupling Rods and Screws Royal Scot (X9743).html https://www.newmodellersshop.co.uk/hornby_spares/x9749_hornby_spares_coupling_rods_patriot_class_royal_scot.htm one set is a narrower diameter than the other, thats because one set is designed for a loco with a speedo to be fitted. The other option is of course, someones swapped a driving wheel and removed a speedo.. but as the stock Hornby photos of R3633 show a loco without speedo, it suggests the wheels are right, which by QED leaves the rods as being wrong, if you still dont believe me reading the service sheet… theres two different sets of rods… item 7…. Look at R2630 and R2664.. (there is no current published sheet listing R3633… ) I should point out that Patriot and Scot wheels are different also, but as this is a Patriot and those look like Patriot wheels to me. (Scots have balance weights that curve into the wheel, where as Patriots balance weights are flat ended to the spokes). Adding a washer imo isnt the right course of action, the washer is to prevent lateral movement along the crankpin screw . What could happen is the rods sawing away on the screw thread until one or the other wears out. if you do want to persist rather than a washer, try a circlip of an old mainline Patriot/Scot, or 4MT and tighten it behind the screw. That should work and look less unsightly. Unless i’m wrong i’m going to step out here as i’m only trying to help.

There definitely x9743 look at the two urls posted you can see the difference in hole diameter.. after the page loads, click on the images in those links to expand it and see https://www.hornbyinternationaluk.co.uk/?button=moreinfo&qty=31455&moreinfo=Coupling Rods and Screws Royal Scot (X9743).html https://www.newmodellersshop.co.uk/hornby_spares/x9749_hornby_spares_coupling_rods_patriot_class_royal_scot.htm if the loco is new i’d send it back.

Wrong set of coupling rods. Hornby has two types for the Patriot/Scot.. (ignoring the railroad version of Patriot which isnt relevent here). X9743 for Scots/Patriots with speedo X9749 for those without speedo the difference is the speedo has a crankpin/screw to hold it in place on the drivers side rear wheel, so the rod has a bigger hole. X9743 has 3 crankpin screws, washers (2 for the centre drivers, 1 for the drivers speedo rear wheel) and 2 regular for the front drivers, and rear firemans side wheel)… https://www.hornbyinternationaluk.co.uk/?button=moreinfo&qty=31455&moreinfo=Coupling Rods and Screws Royal Scot (X9743).html X9749 has 4 regular screws, and 2 crankpin screws/washers (for the centre drivers) and coupling rods are a narrower bore as theres no crank on the rear driver. https://www.newmodellersshop.co.uk/hornby_spares/x9749_hornby_spares_coupling_rods_patriot_class_royal_scot.htm Looking at your image youve got the rods for x9743 but need x9749. Service sheets here, item 7. You could alternatively fit a crank pin to the wheel, (indeed a speedo too) most Super detail Hornby uses a standard crank pin / screw, and can be push fitted from the inside of the wheel if you knock out the screw thread first.

The 153 in Hornbys range is really railroad quality.. it has a similar mechanism to the 156 and little more about it than the 156.. its been money for old rope for a long time imo, but it ticked that “contemporary” box in the range. The Dapol/Hornby 155 well… all I can say it it matched British Leyland build quality of the prototypes at the time, but BR wisely solved that issue 30 years ago.. were as Hornby quietly and sensibly let that one die, but I was surprised they never made the 153 tooling to be able to do a 155…. They left the front door open for someone else to do it.

The 155 is definitely overdue a retool… a Northern 155 has been a want for a while, but my communist quality 1990’s class 155’s are really well overdue to be shoved off. The 153 with prm mods for TFL is interesting to me too. The GWR 153 should suit Northern fans as a few were running around West Yorkshire in GWR green before heading to Scotrail. The £90 price difference between 2 car class 104 (£389) and 2 car class 155 (£299) is interesting….

No ones mentioned a 153/155 so I will. Though several different names keep doing the rounds on that one, but shrinking an O gauge in paralell would seem logical to me. If its modern image, chances are its duplication, which is risky if the prototype its duplicating is reasonable quality or lower price on the other model.

Dunno but coming off the fourth bridge heading toward Edinburgh they dont half pack a punch and accelerate, you feel the g’s..

Mud that still glows in the dark ?

Booths, Vic Berries ?

To the viewers, who may know less about railways, they probably wont see it that way.

Compared to a Hornby 06 a 00 class 06 might look a bit like TT.

Class 06, theyve done all the rest.

Hornbys new Black 5.. 126 Euro.. 106 Euro minus tax. https://www.modellbahnunion.com/OO-gauge/steam-loco-Stanier-5MT-Black-5-Glasgow-Highlander-BR.htm?shop=modellbahn-union-en&a=article&ProdNr=Hornby-R30226&p=1063 works out 135 Euro / c£115 inc DHL to UK. tax bill usually precedes or follows delivery depending on courier in my experience… so in region of £150 when done… c£80 under list.

We Need both.. 37716 is a fair exception… its probably the last time most of us will see / remember a heavy freight 37 running on scheduled passenger services.