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cup knackered?
Possibly it's the bb shell threading that's knackered.
These exist and will work in damaged frames. JIS taper though – running ISO cranks on JIS taper is a can of worms although I think it's possible.
ok so something which is really pissing me off:
Can I / Shall I chop a threaded steerer??
also, im running Sugino 75 BB and the driveside cup keeps working lose after like 10 miles even though im tightening it like a strongman!! had two other BB's in the frame and both seemed to fit nice and tight, the 75 feels so loose on thread in - cup knackered?