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.
Weird how the other 2 BB's I've had in there have been tight like a tiger - I've thought of just perhaps using some simple PTFE tape as used in plumbing when there's loose threads to fill the gap?
I've never done that but others have. Worth a shot.
@Dick started
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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.