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An update for the tracking controls. The wiper that contacts the carbon tracks when rotated is staked (plastic welded) to the plastic shaft. The little nubs broke off and the wiper comes loose inside the control. I was able to repair these using a soldering iron and carefully melting the plastic. One didn't go so well but I found a circuit board on eBay that had the same control. I bought it and swapped it out. In hindsight, I should have put a drop of superglue to hold it in place then a drop of epoxy to actually bond the part. If one comes loose again, that's what I will do.
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