Bourns 1X 500K Short Split Shaft Audio Taper Push/Pull Potentiometer 500K split shaft push pull - Double Pole Double Throw Small 17mm case size Short bushing - 3/8 inch diameter X 3/8 inch high 18 Tooth Coarse Spline Shaft - Takes 6mm Metric Knob Allows wiring modifications such as coil shifting and tapping and phase shifting