Repair a broken or worn stepper wiper arm

Steps

• Clean up the metal on the damaged wiper arm and cut off the old contact, keeping as much arm as possible (the arm acts as a spring).
• Cut a contact end off a wiper from a scrap stepper, keeping it short since a doubled thickness is stiffer; brighten both faces.
• Flux both pieces and clamp the donor tip onto the original arm in the original contact position, at exactly the original length.
• Solder them together with rosin-core solder (silver solder is stronger).

Systems

• Electro-mechanical

Related tips

• Set stepper wiper finger tension and alignment
• Stepper cleaning, part 1: mark, check and remove the wipers
• Stepper cleaning, part 3: rivets, wipers and lube
• Stepper will not step reliably: sticky activator arms
• What stepper units do in an EM
• Stepper step-up arm returns weakly
• Burnt pad on a stepper unit's contact board
• Kinds of stepper unit

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