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I think that I can move closer to a conclusion on the issue of Prestressed Clubshafts.
Images of golfers using shorter irons exhibit the Prestressed bend through impact that HK wrote about. Most of the pictures of longer shafted clubs did not.
One answer might be that shorter clubs have a greater downward force so that when a clubshaft is initially bent, it may be easier to maintain that bend through impact.
The two photos illustrated in this thread illustrate a reverse bend in the Clubshafts prior to impact but the players appear to be trying to hit up on the ball.
I will keep looking for pictures of a golfer, with a graphite shaft driver who hits down on the ball consistent with TGM theory.
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