Bourns Dual Mini Guitar Potentiometer w/ Push Pull Switch, 250K Audio, Knurled Split Shaft Bourns Model PDB183-GTR21 Guitar Potentiometer with Push-Pull Switch. Used for Split-Coil Pickup Switching Bourns Model PDB183-GTR21 Guitar Potentiometer with Push-Pull Switch allow the guitarist multiple functions utilizing a single control such as split-coil switching for humbucking (double-pole) pickups or stacked single-coil pickups, active electronics activation, and pickup phase switching. Bourns Model PDB183-GTR21 Guitar Potentiometer with Push-Pull Switch is designed to allow the guitarist switching capability and volume or tone controls with a single 18 mm package size potentiometer. The potentiometer is designed with a single shaft that is used to activate the Double-Pole, Double-Throw (DPDT) switch and to adjust the potentiometer. The DPDT switch can be wired for various switch functions. Carbon element, DPDT push-pull switch, 1/4" Knurled Split Shaft, 3/8" Bushing Width, 3/8" Bushing Length, Tolerance: 20 %, Power Rating: 0.1 watt Bourns Series Number: PDB183-GTR21