Bend switch blades at the stack, not along the blade

Bending a blade along its length spoils its spring temper: a relay may then fail to work (less pressure) or buzz (more pressure). Gottlieb advises adjusting at the stack while Williams advises along the blade; adjusting at the stack is safer unless correcting a badly bent blade.

Systems

• Electro-mechanical

Related tips

• Tighten a switch stack before adjusting it
• Gauge switch health by trying the stack screws
• Neighbouring switches in a stack short together
• New to EMs? Do not adjust switches that work
• Why EM switch contacts get dirty
• File EM switch contacts
• Switch gap and adjustment targets
• Normally open, normally closed and make/break switches

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