nervar bb troubles
hi all. I'm trying to restore an old Italian 10spd oddity, a Romeo from Romeo bikes in Rome, circa 1975. As it's a custom in-house build, the components are a really mixed bag: lots of campy, weinmann brakes, and nervar cranks and bb.
my problem: the drive-side bb threads are damaged (lbs nightmare, don't ask), making it so far impossible to reinstall the fixed cup.. the bb spindle is stamped "nervar 117", no other markers anywhere, and both cups are right-hand threaded, consistent with the older french standard (which of course caused the bb to loosen over time, which caused me to try and fix it, etc..). I'm considering tapping the bb shell out to the slightly larger italian thread, but given that the bike is such a mix of standards (tubing is almost certainly italian), is there any chance that the nervar bb could already be italian threaded? did french companies ever make such a bb? it seems weird that a cusom hand-built-in-italy frame would have french threads in the bb. maybe someone replaced just the spindle and the cups are actually italian? I have no calipers and no italian bb to check it with. is this a good idea? what would some of the more experienced mechanics out there do? can you repair a few crossed/mashed threads with special files or something, or is tapping the only way to go? and if it turns out to be italian thread, is there any larger size I can tap the shell to? thanks for your help.