I have severals controls units like this in the pic and I suggest to you buy a couple used units like this (by the way, what model is this attenuator switch, T, Lader, Pot????) and replace each contact!….I can be almost secure that contacts are very common in antiques units attenuators!So these pots are HONKERS and I don't know how I found replace them.
But the protective lids do come right off and I see the issue...now I just need to find a way to straighten out these suckers.
Edit: bent and back in business!
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opacheco