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@Tenners
I just fitted a new BB (buddery smoov) and tried to fit a new rear derailleur.
BUT, (and there's always a fucking but with this bike) the bolt that attaches the derailleur to the hanger is too short.
Well, I think it is. What happens is that I screw the bolt in to the hanger, and it gets tighter and tighter until all of a sudden it just slackens off again. I think there isn't enough thread on either the bolt or the hanger. Would trying another mech tell me which the problem is...?