[Jeff]

chbkk

You wrote-: "

You are advocating the hosel moving in a the “clubshaft plane” while the relatively massive clubhead moving in and out and back in clubshaft plane. We then need to identify a force that makes the clubhead move like that which I find difficult to accept."

You ask me to identify a force that causes the clubhead to move in space in a certain way.

The force that moves the club is the release of PA#4,2 and 3.

What you really need to understand is that the left hand grips the club firmly throughout the swing and the clubshaft's grip never swivel/rotates within the grasp of the left hand. Therefore, the clubface will always follow/duplicate the movement of the flat left wrist/hand throughout the stroke. In other words, the rotation of the back of the flat left wrist/hand causes the clubface and clubshaft to rotate in space at the same rpm as the rotating flat left wrist/hand. From the top of the swing to the 3rd parallel, the back of the flat left wrist/hand remains parallel to the inclined plane, and there is no rotation of the clubface or clubshaft. They are both in the same plane. From the 3rd parallel to impact, the flat left wrist/hand rotates 90 degrees into impact. Both the clubface and clubshaft rotate the same amount. Therefore, there can be no rotation of the hosel around the sweetspot (or vica versa). They move in different planes now (as perceived from a DTL view) because the clubhead has a fixed 90 degree relationship to the clubshaft, and the flat left wrist/hand is now rotating 90 degrees off the inclined plane so that it is perpendicular to the base of the inclined plane by impact.

You also wrote in 2c that the hosel rotates around the clubhead. It looks that way because you are keeping the clubshaft near-stationary. However, in reality both the sweetspot and hosel are rotating the same amount. If you really want to see the hosel rotating around the sweetspot, then loosen your left hand grip at that point and simply twirl-rotate the clubshaft 360 degrees around its longitudial axis (as if the clubshaft was suspended in a lathe) with your right hand twirling the butt end of the club. However, that never happens in a golf swing - the left hand grips the club firmly and the clubface and clubshaft only rotate as much as the left hand rotates in space. During the release swivel phase and the followthrough phase, the flat left wrist/hand and the clubface and hosel all rotate the same amount.

Consider the following diagram demonstrating the clubface rotation during the release swivel phase and the followthrough phase (using horizontal hinging).



Now, you may perceive the hosel or toe of the club rotating around the sweetspot in this diagram depicting the orientation of the clubface in space, but the reality is that both the toe and the heel of the club are rotating at the same rpm as the back of the flat left wrist/hand. The only reason why the toe "appears" to be rotating around the heel of the clubhead, is because it is further away from the axis of rotation of the rotating flat left wrist/hand. In reality, they are all rotating at the same rpm.

Jeff.