Hi Art!
Funny thing is that old Studiomaster (common nickname was StudioDisaster) I fixed up and it actually made me money. It paid for itself x20 with rentals and then it got sold for what you sold it to me. Of all the consoles it might have made the most ROI (return on investment) percentage-wise. Kind of crazy. Can't believe you remember that. It was the 3rd console (if you want to call it that) I bought.
The Gamble HC and SC models (1979 -1985) had their quirks ( oh yeah) for sure but I never had big problems with the pots locking up. Guess I serviced mine more
. They were great sounding at that time and far better on the road than a Harrison... Ah those days...