A golf club swing training apparatus and a method for fabricating it are provided. The apparatus includes a golf club shaft and a slide mechanism. The shaft includes an upper portion and a lower portion that are spaced apart to form a gap there-between. The slide mechanism is inserted within this gap and is connected to the lower end of the upper shaft portion and the upper end of the lower shaft portion. The slide mechanism includes an upper connector, a sliding rail, a rail guide block, and a lower connector that are configured to permit a lateral shift of this lower portion relative to this upper portion during a swinging of the club. The method uses an axial alignment apparatus to maintain the elongated axis of the upper shaft portion in substantial alignment with the elongated axis of the lower shaft portion when the slide mechanism is being connected.