Buy an inexpensive wrench and belt sand / grind it the same thickness as the nut. Use it on the bottom ( against the plate ) and use a normal thickness wrench to tighten the other nut to jam it as designed by the factory.
Nylock will eventually work loose ( I tried them and they worked for a year ). You may have luck if you can find the mechanical lock nut that are "squeezed" on three sides.
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