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Abrasive cleaning is a bad idea. Tuner cleaner and or a rubber pencil eraser are the 2 best things to clean tuner contacts with... If you don't have tuner Cleaner sometimes the eraser alone is enough.
You may have to readjust fine tuning after cleaning contacts... Some portholes make it easy, others have this goofy spring loaded shaft that you have to push in each time a new channel is selected to to the fine tuning... Sometimes they put it where you're at risk of touching the metal cone CRT while adjusting it..
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