[Jeff]

Donn

I posted this photo



You then responded as follows-: "The picture of Tiger, sure shows the Impact Circle Axis and the Left Shoulder Center of Impact Circle that V.J. presents in his book."

You are making a big mistake. In constructing my composite photo, I only used one image of Tiger Woods, and superimposed the yellow lines on that photo to show the general change in position of the left arm in the downswing time sequence. However, those yellow lines do not point at the same point, because the left shoulder is always changing position.

Here is the true reality.



I used a spline tool to trace the movement of Tiger's left shoulder during the mid/late downswing. You can see that his left shoulder continuously moves upwards and to the left as the downswing progresses - see the three white dots with interconnecting red lines. VJ's representation of Ben Hogan's left shoulder socket as being a single fixed point in space is an oversimplification, and it doesn't represent true reality. It is a gross over-simplification - equivalent to representing Ben Hogan's downswing clubshaft plane with a single plane line when the clubshaft is actually changing planes continuously as it moves down from the turned shoulder plane (at the end-backswing) to the hand plane (at impact).

Jeff.