PSA: Place rubber washers under knobs to prevent your settings from being accidentally changed! : r/guitarpedals
Amazon.com: DaierTek Guitar Effect Pedal Knob Metal Black Potentiometer Knob Anodized Aluminum Amp Pot Knob with Set Screw 1/4 -13Pack… : Musical Instruments
How to remove those knob covers on MXR pedals? | The Gear Page