Uh oh, somehow both the main pivot bolt and frame thread it screws into on my stumpjumper has stripped to the point where it doesn’t engage at all. I need a knowledgeable engineer type for some advice.. is there any way to fix it short of spending £250 on a new rear triangle and bolt kit?
This isn’t my photo but shows the same problem although on mine, the stripped section lies at the far end of the bolt.
Thread pitch measures 1mm. Bolt is 66mm long M12 and the head is 15mm diameter.
Possible ideas I’ve run through so far:
1) Buy a new longer bolt and add a nut to the end – possible problem getting the bolt head the right size to recess into the frame spacer?
2) Attempt to re tap both the male and female thread – would this ever work? Also 1mm thread pitch taps don’t seem easy to come my in M12
3) Use something like JB weld – I guess its a high stress position in the main pivot so may not hold
4) Some kind of insert/helicoil on the frame plus a new bolt? Might be hard to get this in straight as the frame surface is not flat. Also an issue getting hold of 1mm thread pitch?
Thanks!