Wondering if anybody on the forum has expertise or experience in replacing the zero adjust potentiometer on a Twinmax. I tried deoxit but I can't make the existing potentiometer work...it makes the scale needle jump wildly from one end to the other...i can't get it to zero. I think I could replace it myself if I could find the part. This one mounts to the PC Board with soldered lugs rather than the panel. Let me know if you have any ideas. Thanks.