Free play on late-1970s Gottlieb EMs (coin then start)

Steps

• On these games a coin only adds a credit/player; the start switch must then be pressed.
• Add a second contact pair to the start switch stack, wired in parallel with the coin switch.
• Set it so the first part of the button stroke closes the coin-switch pair, and further travel closes the original start contacts.
• Put fish paper in the stack so the two pairs stay insulated.

Systems

• Electro-mechanical

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