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Hi,
I've always taken the metal cover off the tuner and carefully sprayed contact cleaner on the contacts as I turn the tuner. Also rotate the tuner in both directions to work the cleaner onto all contacts. I have heard the pencil eraser method is very helpful but have never done it myself. I guess a good method would be to clean contacts with a pencil eraser and then spray with contact cleaner (tuner lube, De-oxit, etc.) and work the tuner back and forth, being very careful as Old1625 said earlier not to get any cleaner into the coils or inner workings of the tuner or that could cause a ton of problems.
Gilbert
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