05-24-2014, 03:42 AM
I think that some soaking the resistive elements in varsol/mineral spirits, and then alcohol should clean the crap buildup out of it. I found an old tone control of a similar design in a Canadian Westinghouse 801/Columaire 8 chassis, the wooden peg or dowel works exactly how Jerry described. In fact it helped things by adding a small amount of lithium grease on the dowel side of that spring metal disk.
Regards
Arran
Regards
Arran