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I'd have removed the nut and put lock-tite on it. I have seen the threads on the shafts show some wear and the nuts just back off.



A better way would be to go to a fasteners store and get what I've known as "mechanical lock nuts"

These look similar to castle nuts, except that they are "crimped" a little to go on tight. Some brands aren't castellated, but have a rather odd looking crimp on top. These go on hard all the way and stay put

Nylock nuts are nowhere nearly as stable as these