Flipper crank pinch screw won't budge during a rebuild: heat it to soften threadlocker
During a flipper rebuild the hex pinch screw on the flipper crank can be locked so tight that an Allen key bends before it turns. Spraying it with penetrating oil, then heating the screw to soften the threadlocker, let it come out with an Allen key and pliers for leverage. When refitting, tighten it firmly so the bat cannot slip on the shaft.
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Games
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Source: Pinball Repair help group!! (Facebook group)