Re: Tinsmith's in frame gas tank for cantilever Schwinn.
The brass acorn nuts now need to be tinned in the same way the bung was tinned. The bolt is threaded into the nut to guard against any solder getting into the nut's threads. With that done the nut is secured to the bottom and again the bolt is attached. Nuts are soldered to the bottom piece and then the piece is tacked at the upper end of the tank. Note that the petcock has already been soldered to the tank in the photo (which is tank #1).
Someday when I grow up I will probably lose interest in toys with wheels, but until then...