Maintenance for aging 301's

Hey everyone. I got my 301 second hand and I want to give it a good clean, replace the switch caps etc.

I was wondering about 2 things.

  1. The jack nuts are a little tarnished from air exposure and I want to brighten them up. I was wondering if there’s an easy way to do it without scrubbing them with a brush? cuz that’d take forever.

  2. The encoder is a little bit wobbly. I tried tightening the screw but it changed nothing. It’s not that bad, is this normal?

  3. The screen lenses have a bit of light scratching. I’m nitpicking but it bothers me. Besides the guys who are finding out how to make customs, is there a way to refurbish or buy new ones?

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