Hold a aim stick across your chest with your hands crossed over one another forming an X and an aim stick or golf club lying perpendicular to the target line lying just inside of the lead and trail foot, address the ball and turn back where the aim stick held against your chest points at and passes through the ball and stops just short or at the club lying inside the trail foot. Now turn back on the follow through where the other end of the aim stick passes through the golf ball and past the club lying just inside your lead foot. The angle you feel is the proper angle in relation to your spine angle. This shoulder turn angle is steeper for wedges and flatter with your driver due to the shaft length. You can use the club in question instead of an aim stick held against your chest.