Abstract: A locking and tuning stabilizing device for an electric guitar having a tremolo device includes a clamp screw and an adjustment screw to enable the player to lock the tremolo or to stabilizing the tuning of the strings by turning an appropriate, easily accessible knob projecting from the guitar. In a first embodiment, an axially movable pin is in contact with the tremolo device at one end and in contact with an adjustment screw disposed in the end of the guitar at the opposite end. In second and third embodiments, an anchor block is disposed within a cavity on the back of the guitar. A pin connects to the tremolo device and is axially slidable within the anchor block. Clamping the pin to a fixed position within the anchor block, by tightening a clamp screw disposed in the anchor block, functions to lock the tremolo device in place.