• Carl N.

    I have that same problem on some of my instruments.  The best solution I have found is whats called a detent potentiometer.  Basically, it's a pot that has a point that catches and clicks.  Some of these are oriented in the center, for balance pots, and some are at the beginning or end of the washer's travel.  This way, whenever your hand strikes the volume knob it won't accidentially turn your volume down.