Reply by Steve Peterson

Does it have a standard nut at the bottom? I don’t have a Jet lathe, but suspect that many lathes have a similar design. My lathe has a nylon locknut, the type with a nylon insert to hold it in place. Over time, the nylon gets loose and stops holding onto the bolt. A new locknut or 2 thin nuts (also called jam nuts) tightened together solved my problems. This keeps the bottom nut from working loose every time I tighten the top locking lever.

-- Steve