Original Fender® chassis-mount hum balance potentiometer, 100 ohm.
Fender Part# 002-8421-000
• 100-ohm potentiometer used for hum balance control
• 1/4″ threaded brass bushing for mounting to amplifier chassis
• Adjustable level control (flat-head screwdriver only)
• Mounting nut and washer included
• Adjustable from both the front and back face of pot
• Used for ’65 Twin Reverb®, Machete™ and Vibrasonic amplifiers (1992-present) plus others