Mr. Pinball Tip:

When tightening lock nuts with recessed nylon, you do not need to tighten very much. These type of lock nuts will not loosen due to vibration so you only need to make them a little snug. Tightening these too much will cause problems. These are the kind of nuts that are on the underside of pop bumpers that secure the ring and rod assembly. Overtightening these will cause the threads on the rod to snap off--and then you'll have to completely disassemble the bumper to replace the broken ring and rod assembly!
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