Fouled 12mm x 1.25 crank thread

[WobblyHand]

Can you just cut a nut through to the threads on one side and use that? It should flex enough to start? At least once the OD of the thread is close. Might need to use a triangle file for that.

 

[tq60]

Thread repair file?

Maybe none in metric sizes?

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[Pevehouse]

I have also had good luck with an OTC 7402 chaser working from the good section backwards.