While pulling some parts off of an old Bally Freedom backbox I decided to try an experiment. The credit assy had a bit of corrosion:
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Of course it did not work & took a bit of effort to disassemble. Gave the metal bits a bath in Evaporust & the remainder went into my ultrasonic cleaner. Once the rusted parts were devoid of corrosion, I gave them a coat of flat nickel rustoleium:
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& reassembled:
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Unit now works as it should, & looks presentable.