Pop bumper bracket with a loose coil stop can be saved by re-peening it
When rebuilding pop bumpers, a coil stop that has worked loose in its bracket does not mean the bracket must be thrown away. Rest the bracket on a solid steel support (a vise works) and give the stop's peened end a few hard blows with a ball-peen hammer until it is tight again. On this Whirlwind three loose stops were tightened this way and the owner expected them to last as long as the others. Replace the bracket if the stop is cracked.
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Source: Pinball Repair help group!! (Facebook group)