• A thread file might get it back in shape.

    I wonder of you could just chase the root with a steel pick or something home made?

  • Isn't an old-school BB lock ring the same thread? Since they're steel @Eseman might be able to hacksaw one in half, close the halves together on the intact section of thread, jubilee clip/zip tie the halves together and then clean up the thread by winding it off.

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