Second attempt. Does the household's sewing box [DN please note careful drafting] have any brass wire - the soft stuff used for beads etc rather than the steel-cored? A couple of turns of that on the threads might lock without seizing forever.
In message , Huge writes
You can *stiffen* a nut thread by centre punching a few dents in the top face.
Aerotight nuts are used in high temperature environments.
Dunno how you can get just one mind.
Simple enough to make something similar from a nut and a piercing saw.
FFS a nyloc like those shown here will be as much use as a chocolate teapot on a woodburner. There *are* locking nuts made entirely from steel, for example a normal nut with two slits, then deformed to provide a sort of spring clamp. If you can find them to suit.
I assume the pin is about 6 mm diameter which is a bit small for a castellated nut and split pin. You could use lockwire, but it had better be stainless steel.
Two nuts is the *easy* solution.
FFS why don't you read the info? There is a wide array of locking nuts shown.
Now this I shall try.
And if you don?t have enough thread, replace that so you do.
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