Self-cleaning "over-wipe" switch adjustment

When the moving blade reaches the fixed contact, it should push the fixed blade slightly and slide across it as the stroke continues. That wiping keeps contacts clean even when dirty, so a game whose switches all wipe usually works without filing.

Systems

• Electro-mechanical

Related tips

• Switch gap and adjustment targets
• Look over every switch before first power-up
• New to EMs? Do not adjust switches that work
• Tighten a switch stack before adjusting it
• Adjust a leaf switch at the stack
• Normally open, normally closed and make/break switches
• Game stopped working after filing switches
• Bend switch blades at the stack, not along the blade

Source: Repairing Electro-Mechanical (EM) Coin Operated Games to 1978, Part One, Clay Harrell (pinrepair.com)