Its really one step forward and three back. To form the larger diameter smoke box, the instructions suggest making up a 'tin lid ' with the front plate and a packing ring. I don't think my skills are up to making a neat lid and it slip happily on to boiler. So I used copper wire to tighten the rings on to the boiler and soldered them on, adding the front disk afterwards. I was then able to file that rounded edge. I don't like sealed boilers, so cut a larger hole in the rear disk so the a speaker or anything else can be passed in to the boiler. The rear disk doesn't need to be flush with the end section of the full boiler. Setting it in a few mil allows a good soldered joint to be created.
For the rear set of spacer rings, I measured measured measured - and scribed a line for the rear most rings position on the boiler. For the ring just inside the wrapper, I tacked that to the inside of the wrapper, so that I could accurately ( or not ) control it's potrusion of just under a mill. After tinning the outside of the rings and then clamping the smokebox in position with copper wire hoops, I attempted to use the resistance solderer to fuse the whole lot together... It seems to be in place. I had to sleep on that one to work out how to do it...
After a trial fit of the boiler, I then found that the forward part of the running plate was 2mm too long.. So off with the front platfrom ( again ) and I used the piercing saw to shorten it... I struggled with the saddle, trying to solder 6 components together and keep them square was a challenge! I still ended up with a gap at the front, that might need to be filled in as the next task is to get the boiler to sit level.....
