File EM switch contacts

Steps

• Switch the game off.
• Use a Flex-Stone or small point file, or 400 grit paper folded into a strip; never an emery board, which leaves grit between contacts.
• Hold the contacts together on the file with fingers, needle-nose pliers or a small screwdriver, firmly but without bending the blades.
• File until the faces are bright, but no more; over-filing thins the contacts and changes the gap.
• On Gottlieb feature and reset banks there is no finger room, so pinch the contacts and file with needle-nose pliers.

Systems

• Electro-mechanical

Related tips

• Why EM switch contacts get dirty
• Tungsten contacts need a metal file
• Cleaning leaf switch contacts
• New to EMs? Do not adjust switches that work
• A switch blade has lost its contact
• Replacement switch contacts for EM games
• Switch gap and adjustment targets
• Tighten a switch stack before adjusting it

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