Well, by accident I stumbled across a method for nicely securing the tang to the patent breech for inletting into the stock without solder, epoxy, super glue or screws. Just make thin brass shims to the size of each half of the tang face, thick enought to require a bit of a tap on their respective sides to get them in. I made mine of hobby shop sheet brass, and, since I'm not a terrific filer, the one to port is thicker than the one to starboard. In any envent, when they're in place, the whole assembly is very secure and can be inlet as a single unit. In the attached picture, I've pulled the shim from the snail side; the other is still in place.
Clay
San Jose
Clay
San Jose