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Good Evening,
I just recently refurbed a 75 xl100 - you can find the photos a page or 2 back.
Those slider pots are a bitch! Didn't have any success with cleaning the originals, so replaced mine with NOS parts. Might have worked better if I had put more effort into it, and was thinking about some type of lube, probably a scant amount of baby oil. IIRC lots of cleaner agents have baby/mineral oil in them, so a minute amount won't hurt.
Take that aux control unit out and look at the part #'s and manufacturer of the sliders.. Google it and I think you will find that they are still manufactured - in England if I remember correctly.
BTW, retrofitting 4 standard rotary pots of the correct value onto/through the holes on the masonite back of the set was an option I was considering if I could not locate replacement slider pots. I see no reason it would not work - once set, little adjustment is necessary.
Best of Luck
RWB
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