Terribly old fashioned I know but I'vr still got some in the cupboard. Am I right in thinking that the only difference between 68mm and 73mm square taper BBs is the none drive side collar/insert/doohickey thing? Got a 73 and a 68 and they look to my eye identical apart from the end stop on the NDS collar being 5mm different.
If thats right does anyone have and 73 NDS collars they don't need (or want to swap?) coz I've got a few 68mm BBs but only 73mm frames.

