Give Deoxit spray a try, taping the areas around, since it's contact safe, it's ok to use as a cleaner there. I had used it on a sticking "road hazard" button on my E86M, worked great.
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02 E39M5 | TiAg/Schwartz | Tubi Rumore | Ultimate Ti Pedals | E60 SSK | Jim Blanton 3.45 40/100% | Coby Alcantara | StrongStrut STB
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