I AM SEARCHING TO REPLACE OR REPAIR THIS CONTROL.IT HAS BEEN EXPLAINED TO ME THAT ONE OF THE DBL POT. 100K POTENTIOMETERS HAS THE CARBON WORN OFF.I HAVE THE ORIGINAL PART.THIS STEREO WAS PURCHASED IN THE 1970'S.THE STEREO IS MDL.IP3963,THE CHASIS #IS R24102AA FROM WHICH THE CONTROL IS LOCATED.THANKS,RVG1950@gmail.com,ROBERT