The Knob Puller is a simple solution for stubborn knobs. Just slide it under the knob, push the tension ring down for a firm grip, and carefully pull the knob off. It works with standard speed knobs, bell knobs, and Strat® knobs. The smooth durable plastic helps protect pickguards and guitar finishes.
Guitar repair shops will use this everyday, but if you're pulling bushings too, consider the Knob and Bushing Puller.