A roundup of work so far on the tender.Why is it that no matter how I hold parts in alignment, they are always out of alignment after soldering, ie,the tender side sheet
I’d hazard a guess: you got the side sheet hotter than the footplate (with all the other structural bits already attached, so big thermal mass) when soldering them together, and when the assembly cooled, the side sheet contracted more than the footplate. Footplate ends up curved, and can only move one way because the side sheet stops it going t’other.
Rather than flood with solder, which will leave you with a dished footplate, and one or both ends of the side plate marginally in the wrong place, you can remove it and try again, but start by tacking the middle, or unsolder one end, let it cool, then resolder. Lots of flux, clean job & solder, hot iron, minimal solder on iron, and in-out quick.
or, if you’re brave, take the body off the chassis, lay it on a tile or firebrick, ensure the side plate can’t fall over, and a very quick blast with a blowlamp will run the solder the length of the job very neatly.