• I’ve had something similar on a bike and it was the threads in the nut being worn. I think it was cross threaded at some stage and threads got chewed up and therefore left little thread behind for there to be any grip. It’s like it would jump out of the threads. Fixed with a known good lock nut.

  • Ah, that's interesting. The canti hanger is taller than the washer that was originally on there, and maybe that means the top nut has fewer threads to grab onto. I'll try swapping it out for a thinner steel hanger.

    Thanks!

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