Mr. Pinball Tip:

Don't use an emery board to clean contacts on electromechanical pinballs. If you do you'll end up with some switches that won't work because the emery board will leave grit in the switch. You can solve this by blowing on the switch after you file it. The preferred method is to clean the contacts using a flexstone or point file, both of which little or no grit.

Note that you should NEVER file a gold-plated switch on a solid-state pinball. Almost all switches on solid-state machines are gold-plated.
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