This Pro-swing practice club consists of a shaft, a thick 9-inch long spring, and a heavy brass ball on its end.  The club is designed to be swung and give the user a greater sense of how the wrists should release the club through impact, and more.

According to a 1933 Pro-Swing advertisement, "The Pro-Swing principle of balanced weight and spring induces just the right amount of pull on the arms and body to produce smooth rhythm and correctly applied power." 

Produced by the Pro Swing Golf Co, Inc. of New York City, Pro-Swing practice clubs were marketed as the cure for any number of faults and the teacher for golfers of any level.  "It makes you swing correctly. It compels you to drag back the clubhead instead of lifting it too soon.  It compels you to shift your weight correctly.  It compels you to put wrist snap into the shot.  It compels you to follow through."

This example is in solid condition. but it has lost the pin that holds the spring in place at the base of the shaft consequently the spring can be unscrewed and removed.  In one image I show the screen partially screwed out of the shaft. There was a fair big of engineering used to create the hollow threaded shaft so the spring could screw into it to help hold it in place. An interesting piece.

This lot is in the accompanying group image.