7 string bass basskit bass kit beatle bass beginner bridge bridge position build direct mount humbuckers dye es-1f ex-1 ex-1e ex-4 falcon fender finish first build first time builder fretboard fs-1 starcaster gms-7z gr-1sf gretsch guitar guitar build hb4 hollow body i need help jm-1 les paul neck join mahogany maple marcel multiscale music my build diary neck newbie new member nitro pbass pedal phase pickups piezo piezo blend pitbull guitars rc-1 pickups sanding scale length setup shim single cut soldering ssr-1 st-1 st-1jr 3/4 tb-4 tele headstock tele style bridge plate thunderbird tl-1 tuning peg gear ratio veneer wet sanding which kit wiring wiring diagram