Contact files only on flipper switches

A small contact file may be used on relay-style end-of-stroke and cabinet flipper switches only, never on gold-plated switches. Filing is often only a stop-gap; a pitted switch usually needs replacing.

Systems

• Williams System 11
• Williams System 11A
• Williams System 11B
• Williams System 11C
• WPC Alpha-Numeric
• WPC Dot Matrix

Related tips

• Every System 11 flipper has an EOS switch and coil diodes
• Weak flipper: rectifier or worn parts
• Weak flippers from pitted EOS switches
• Measuring a pre-Fliptronics flipper coil and its EOS switch
• Weak flipper: dirty end-of-stroke switch
• Pre-Fliptronics EOS and cabinet switches: file clean, open about 1/8"
• Flipper coils have two windings
• How relay-enabled flippers work

Source: Pinball Machines: How They Work & Troubleshooting, Norbert Snicer