Hand tools for working on System 3-7 games
Besides a clamp work light, keep small and medium Phillips and flat screwdrivers, 1/4", 5/16" and 11/32" nut drivers, 3/8", 9/16" and 5/8" wrenches, a set of inch-size Allen keys, needle-nose pliers and straight and curved hemostats for holding springs.
Systems
Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part One, Clay Harrell (pinrepair.com)