Amazon.com: DaierTek Guitar Effect Pedal Knob Metal Black Potentiometer Knob Anodized Aluminum Amp Pot Knob with Set Screw 1/4 -13Pack : Musical Instruments
16mm Alpha Hollow 6mm Shaft 500k Linear Types Pcb Terminal Guitar Pedal Use Potentiometer - Buy 16mm Potentiometer,500k Linear Potentiometer,6mm Shaft Potentiometer Product on Alibaba.com
Amazon.com: 24pcs Shaft Metal Potentiometer Control Knobs 6mm,Black Guitar Pedal Knobs,Dimmer Knob Swicth Replacement,Volume Control Knob Encoder Black,Kelyonewy : Musical Instruments
1K Log (A) 16mm Alpha Potentiometer - PCB Mount - AUD $2.10 : diyguitarpedals.com.au, A shop for all diy guitar pedal enthusiasts!