Abstract: An adjustably tensioned snap-release joint for use as a golf club swing training device is described which includes an upper shaft insert, a lower shaft insert, a screw inserted into a first bore in the lower shaft insert and inserted into a correspondingly threaded second bore in the upper shaft insert, the screw defining a rotation axis of the lower shaft member in relation to the upper shaft member to a transverse axis from a longitudinal axis defined by a linear alignment of the upper and lower shaft inserts in the golf club, an indentation positioned in a co-linear axis with the longitudinal axis of the golf club on an interior surface of the upper shaft insert, and an adjustable spring-biased hollow screw assembly having a ball positioned at the tip of a threaded shaft, capable of exerting pressure on the indentation.