Tightening structure of musical instrument stand

A tightening structure of a musical instrument stand, comprising:

• a movable member, having a first connecting portion for connecting a first arm of the musical instrument stand;
• the movable member being provided with a cylindrical shaft extending outwardly therefrom;
• an immovable member, having a second connecting portion for connecting a second arm of the musical instrument stand;
• one side of the immovable member having a recess formed therein, a bottom of the recess forming a semi-circular arc with a radius of curvature corresponding to that of the shaft, the cylindrical shaft being inserted into the recess and abutting against the bottom of the recess;
• the immovable member being provided with a first screw hole passing through a top portion of the recess, the first screw hole being perpendicular to an axial direction of the cylindrical shaft;
• a first threaded fastening bolt, screwed in the first screw hole, one end of the first fastening bolt being inserted into the recess and having a flared exterior end portion, another end of the first fastening bolt being connected with a handle;
• wherein when the handle is rotated, the flared end portion of the first fastening bolt is drawn against the shaft, thereby holding the movable member stationary.