Knob and Bushing Puller Knob and bushing puller Has a rubberized bottom rim for protecting the guitars surface while removing knobs and tailpiece stud bushings. Includes (6) bolts and (2) flat washers for pulling various bushing threads:  5/16-20  5/16-24  5/16-18  10-32  M6 x 1.0  M5 x 0.8