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Coil stops by maker

Bally: A613-67 for most EM coils and A613-127 for linear-style flippers. Williams: A8143 (AC or DC) for most EM and early solid state coils. Gottlieb coil stops have a replaceable core, and bolt-on Gottlieb stops can often be bought.

Systems

Related tips

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