Hello! Can You tell me, what size of the set screw is used in Jazz Bass stack knob? 8-32 or 6-32? I convert my bass into a Stack knob with concentric pots. As You know Fender doesn't sell the upper knobs with set screw, which is strange thing for me. I live in Europe and unfortunately my local music shops don't sell knob set screws I found some screws in UNC size but, I"m not sure which size is correct. Please help!