Originally Posted by
tomtomtom123
On my dahon bike that originally came with square taper, the bb shell faces had dried blobs of paint on them that prevented the outboard bearing cups from seating flush against the shell. So it had to be shaved.
Oh, that's easier to remedy. My Dahon was old enough that it came with cone and cup bearings and not cartridge, so the BB shell faces were already smooth from the fixed cup and lockring bearing against them. A BB shell or headset facer is one of the few tools I do not own. If I replaced cranks often, I'd buy one.