I usually go to the hardware store and buy some standard nuts to use as mockups. They are cheaper than nylocks and are easier to take on and off during mockup asembly.
If you have run those nylocks on and off more than a couple of times, they need to be relaced with fresh ones. I always do my final assembly with new nylocks and some red loctite on critical assemblies.
Nylon locking devices are NOT allowed on commercial or military aircraft equipment, lock washers, deformed thread type locking devices, safety wire are OK and avoid locktite if possible, messy in the field and amount used not specified. Nylon "takes a set" and after thermal cycling will eventually come loose. It was a no no at Honeywell, Allied Signal, Boeing, etc. But on auto's, go for it. I don't like to use them on my projects. They do come with many aftermarket parts I buy.
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