Hand tools for EM work
Keep small and medium Phillips and flat screwdrivers, a long flat screwdriver, 1/4", 5/16" and 11/32" nut drivers (one magnetic), 3/8", 9/16" and 5/8" wrenches, Allen keys including T-handle ones, needle-nose pliers, a hemostat, a right-angle ratchet screwdriver, a flat bastard file for EOS and cabinet switches, small wire brushes, a rotary tool with cut-off wheel, wire cutters, heat shrink, tape and cable ties, and a small mirror and magnetic pickup.
Systems
Source: Repairing Electro-Mechanical (EM) Coin Operated Games to 1978, Part One, Clay Harrell (pinrepair.com)