I'll throw this out there for Lefever guys. Pretty sure Bill Schwarz in Ellijay used to specialize in Lefever restoration. I believe this was before he came to his senses and moved south of the Mason-Dixon line, although I'm sure he still works on Lefevers.
I've had good luck with him tightening up two older German guns, one by welding and filing the barrel hook and the other by welding and filing the sliding underbolt. Both jobs were flawless and the guns locked up tight as new afterwards. In any case, he will never take a ball peen hammer and 'tighten' your gun (unless you are foolish enough to request it).
He also does his own rust bluing and case colors. I had him rust blue a third German gun, and the lettering on the barrels came out sharp, the barrel flats were not blued over and came out looking original.
