Abstract: Neck truing devices may include a first member that is adapted to be fixedly embedded within the neck of a stringed instrument. A second member may be coupled to the first member and connected across both ends of the first member. An adjusting mechanism may be operable to selectively apply a first force to the first member via the second member in order to correct warpage of the neck in a first direction and a second force to the first member via the second member in order to correct warpage of the neck in a second direction.

Abstract: Neck truing devices may include a first member that is adapted to be fixedly embedded within the neck of a stringed instrument. A second member may be coupled to the first member and connected across both ends of the first member. An adjusting mechanism may be operable to selectively apply a first force to the first member via the second member in order to correct warpage of the neck in a first direction and a second force to the first member via the second member in order to correct warpage of the neck in a second direction.

Abstract: In a tremolo arm adjustment mechanism in an electric guitar, a tremolo unit is provided with a mounting hole for the tremolo arm penetrating through a body section and a block section in the vertical direction, a male screw portion threaded on base portion of the tremolo arm is threadedly engaged with the mounting hole from upper side in freely traveling state, a torque adjusting screw is threadedly engaged with the mounting hole from lower side in freely traveling state, and a spring is interposed between the torque adjusting screw and the male screw portion, thereby mounting height and rotational torque of the tremolo arm can be adjusted individually.