I have just finished fitting the 22 smoke hoods and chimneys to the roundhouse roof trusses. In order to enable future maintainence I decided I needed a method that allowed easy removal and chose to use two lengths of 0.8mm nickel silver wire to fix and support the piece brass tube used for the chimney section of each unit. These can been seen in the attached photos.
I also needed a suitable height jig to postion each unit at the correct height and orientation in order to mark the position for the support wires. By chance I found that the Ballast Spreader marketed by Greenscenes http://www.green-scene.co.uk/ proved to be ideal. Not only is it the correct height but when inverted I could use the grooves for the rail as a guide for aligning the chimney hoods to each road of the turntable.
The 8 octagonal support columns have been temporarily fitted in order to assist supporting the weight of the roof trusses. These are from Alan Gibson and are cast white metal - originally produced by AG for Bath Green Park Station. They have been modified for Barrow Road with turned bases and a length of 3mm brass rod inserted into the top to slot into the roof girder. This work was kindly carried out for me by Morgan Gilbert - thanks Morgan.
Here are some photos.
You will note that some of the resin smokehoods are temporarily fixed using masking tape. This will be replaced by nickel silver wire.
Each smokehood will also have handrail knobs - Markits WD variety - fitted to the 4 corners in order to attach 0.6mm wire for additional support.