[BerntR]

But because the Flat Left Wrist and Clubface remained aligned (Left Arm Wedge) during the 9-3 interval, they have the same Rhythm - RPM.

I have a too strong academic and work background in science to take what you say here seriously.

The clubhead travels at a much higher RPM through impact than the hands. I don't know any way of explaining that any further than I've already done. I am just decribing something that any one who studies film footage of golf strokes can see with their own eyes. I don't understand how anyone can dispute a fact that is so in your face.

This overtaking is the main reason that good rhythm doesn't come by itself. The Flat Left Wrist helps you to sense and control the overtaking of the club. Lag pressure - linear force - helps you to keep the left wrist flat until low point.

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Here's for those of you who sees the difference between the same RPM and the same basic RPM:

The physics of this overtaking is such that the hands will be slowed down during the overtaking and the flat left wrist will break down prior to impact - unless the golfer does something to prevent it.

Here's a double pendulum model you can play with: http://www.maths.tcd.ie/~plynch/Swin...ependulum.html

Notice how the "flat left wrist" (the first mass) stalls and collapses shortly after the "club" (the second mass) is released.

Hit restart a few times and watch the "stroke". Then change parameters. Increase the first mass significantly and see what happens.

Of course in the golf stroke we have to substitute this mass increase with lag pressure regulation (linear force).