He wrote this ...
Question: What Does the Expression "The Shaft is the Engine of the Club" Mean? Is It True?
Answer: It means that some golfers believe the shaft to be the most important part of the golf club, which really is not true.
Sticking with the automobile anology, the shaft is really part of the "transmission" of the golf club. The golfer is the engine.
The role of the shaft is quite simple. It elicits the primary control over the total weight of the golf club, and it has a minor to medium effect on the trajectory or height of the shot.
What makes some golfers believe that the shaft is the most important part of the golf club is a very interesting part of the performance of the club that we call "feel." For golfers who have the ability to perceive the bending feel of the shaft during the swing, using a golf club with a shaft that is much too stiff or much too flexible will result in a fairly universal reaction to the shot: Yuck!
So when golfers who possess such a refined sense of feel for the action of the shaft happen upon a shaft that elicits a pleasing response, these golfers appreciate that feel. And many form the belief that the shaft is more important than it really is from a pure performance standpoint.
In truth, the clubhead is the most important part of the golf club. How so? Put the perfect shaft for a golfer into a clubhead that is ill-suited for his swing and the shotmaking results are definitely going to be poor. On the other hand, put the golfer into the absolute best clubhead for their swing but install a very stiff or flexible shaft and the shotmaking results will still be pretty good in terms of distance and accuracy. The feel may be poor, but the actual shotmaking results will still be better than if the golfer uses a clubhead that is a very poor match to their swing requirements.
What do you think?

Question: What Does the Expression "The Shaft is the Engine of the Club" Mean? Is It True?
Answer: It means that some golfers believe the shaft to be the most important part of the golf club, which really is not true.
Sticking with the automobile anology, the shaft is really part of the "transmission" of the golf club. The golfer is the engine.
The role of the shaft is quite simple. It elicits the primary control over the total weight of the golf club, and it has a minor to medium effect on the trajectory or height of the shot.
What makes some golfers believe that the shaft is the most important part of the golf club is a very interesting part of the performance of the club that we call "feel." For golfers who have the ability to perceive the bending feel of the shaft during the swing, using a golf club with a shaft that is much too stiff or much too flexible will result in a fairly universal reaction to the shot: Yuck!
So when golfers who possess such a refined sense of feel for the action of the shaft happen upon a shaft that elicits a pleasing response, these golfers appreciate that feel. And many form the belief that the shaft is more important than it really is from a pure performance standpoint.
In truth, the clubhead is the most important part of the golf club. How so? Put the perfect shaft for a golfer into a clubhead that is ill-suited for his swing and the shotmaking results are definitely going to be poor. On the other hand, put the golfer into the absolute best clubhead for their swing but install a very stiff or flexible shaft and the shotmaking results will still be pretty good in terms of distance and accuracy. The feel may be poor, but the actual shotmaking results will still be better than if the golfer uses a clubhead that is a very poor match to their swing requirements.
What do you think?