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Evidence above of me trying to avoiding frame failure by cleaning my bike.
I'm sure if i did bother to wash it I would have seen a massive crack months ago. It has been very... musical for a while.
The Swiss have a thread?
https://www.sheldonbrown.com/cribsheet-bottombrackets.html
Very close to british threading but in metric. Slightly bigger shell, slightly fewer TPI.
Normally they only snap when you clean them.
Most odd.