360 build thread

So ive been trying to figure out the best way to mount this kevko pickup. I only have a limited amount of thread above the tab, i tried finding a thin jam nut but couldnt at the local hardware store so my next thought was a castle nut with some wire wrapped through but i didn't like how that was turning out. I don't really want to removing the nut and washer on the main stud but I'm open to suggestions heres a couple pics for reference. So far im right in the .25 to .375 for pickup to pan clearance. Also thought of running no nut, not sure how much that pickup is going to move.

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I would not run it without the pickup tube being supported. Maybe figuring out a way to safety wire the hold down nut would be a good option.