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@Crank_Puller
I had a Raleigh 501 frame got a new BB and after installing it we noticed there was a gap between
the outside BB plates and the frame on the front side. So either the thread was off square or the
BB shell faces were not cut absolutely parallel. Anyway works fine now (with a fixed wheel and 15 stone driver) so presumably the latter.
If the BB destructs its possible someone may have 'cleaned' a thread a bit much.
Maybe worth knowing if its an italian thread as they can loosen?