Shoulder member and pipe member connecting structure

A shoulder rest for a stringed instrument with a support element extending in a longitudinal direction for resting on the shoulder and/or chest of a player, comprising a number of hinged clamping units arranged on the support element, a shaft of each clamping unit being mounted by means of integrally formed pivot pins in an associated pivot bearing, each pivot bearing including bearing shells designed in the manner of an arc segment, wherein the bearing shells do not engage around or enclose each respective pivot pin completely but only over a certain arc length, each clamping unit further comprising a respective holding clamp disposed on and supported by a threaded shaft threadable into an internal thread integral with the shaft of the clamping unit, wherein the shaft of the respective clamping unit is guided eccentrically or off-center such that a central axis of the shaft does not intersect an axis of rotation of the respective pivot bearing in a fully unfolded state, but passes the axis of rotation spaced apart by an offset, and further comprising a set of interchangeable shaft elements having different offsets, such that a clear width between the respective holding clamps in the fully unfolded state can be varied by replacing one of the interchangeable shaft elements.