Adjusting a microswitch
Microswitches need no cleaning. To change when one trips, slacken its two mounting screws and rotate the whole switch a little; never bend its lever. Do not over-tighten the screws, which can bind the switch.
Systems
Related tips
Source: Repairing DataEast 1987 (Laser War) to Sega 1995 (Batman Forever), Part Three, Clay Harrell (pinrepair.com)