Originally Posted by
Bob Barker
If the Simplon has English BB threading finding a correct JIS BB should be easy
Yes. But an Asian company, known here as Token, makes a line of really nice replacement BBs in all threadings (well, French?) and to fit JIS and Campy.
Campy was square in some models at least into 2006. Not all Campy square tapers will be vintage.
Ask on CR about possible issues with the # of times a crank has been R&R'd. I'm pretty sure the response will be that it is not the source of problems.