[dkerby]

Per David Lee - Gravity Golf
Here's what happens. The problem begins when the takeaway is
made with the hands and arms instead of the back and sholders.
By not originating the takeaway, the shoulders and back will
usually be too relaxed when the takeaway begins. When the back
muscles are stretched by the arms going back, being elastic, they
(back muscles) will naturally rebound slightly when the top of the
backswing is reached. When the back muscles rebound they cause
the clubhead to rebound about an inch or so also. When this happens,
the TRUE top of the backswing is the position of the shoulders, arms
and the clubhead AFTER the rebound has occured. Not having
anticipated this rebound of the club, the brain senses that the delivery
is lever deficiency. In other words, the backswing is now TO SHORT for
the club to come up to adequate speed by the time it reaches the ball,
for the shot to reach the target. Sensing this leverage deficiency
coming into impact, (tighten) in order to make up the leverage loss,
and the results are disastrous! The ball will either explode off the
clubface and go to far, or the swing-plane reversal may cause the
player to hit behind the shot - possibly even double hit the ball.

Note: Some say that the procedure is pivot controlled hand instead
of hand controlled pivot? Both Jack N and Lee T have been to see
David Lee about putting.