The Nintendo Entertainment System Game Pak is the software storage medium for the Nintendo Entertainment System. This video goes through the cleaning of the Game Pak / cartridge using a 3.8mm Security Screw Bit, cotton bud, isopropanol fluid
All officially licensed NTSC-U and PAL region cartridges, or "carts", are 5.25 inches (13.3 cm) tall, 4.75 inches (12 cm) wide and 0.75 inches (2 cm) thick. Early NES Game Paks are held together with 5 small, slotted screws. Games released after 1987, designated "Rev-A" on the back label, were redesigned slightly to incorporate two plastic clips moulded into the plastic itself, eliminating the need for the top two screws. This is why older NES carts are referred to as "5-screw" and are distinguishable by their flat tops and, as the name suggests, five screws instead of three. Around this time, the standard screws were changed to 3.8 mm security screws to further secure the ROMs inside from tampering.
