Cleaning
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Black, tarnished contacts on a Sonic the Hedgehog Master System cartridge cleaned up with Brasso and kitchen towel, with the pros and cons of using it.
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A quick how-to: open a Sega Game Gear cartridge with a 3.8mm Gamebit and clean its dirty contacts with isopropyl alcohol.
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A wobbly header tone means a slipping belt. I clean and flip the belt on a 1980s Cathay computer cassette deck, clean the pinch roller and heads, and set the azimuth.
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A five pound set of 3.8mm and 4.5mm game bit screwdrivers for opening Nintendo and Sega cartridges: why handles beat loose bits, and how they held up.
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A Dreamcast that randomly reboots or resets once it warms up usually has corroded power supply pins. Here is how I lift the PSU and clean them.