The following was provided by Ronald Ross on his web site
No Stronger Than His Hands (1934) By Seymour Dunn
“For all strokes of considerable distance the left wrist should be the hinge of the wrist action.
Fulcrum Or Hinge
The right hand must work around the left because the left is the fulcrum or hinge on which the wrist action pivots. That is why the grip with the left hand must be firmer than with the right. The right hand and forearm furnish the power which swings the clubhead through the arc which pivots in the left wrist.
The wrist action should not take place until the lateral hip action which takes care of the of the shifting of the of the body weight, and the downward pull of the left arm which drags the club handle down to the hitting area have almost completed their part in the downswing.
Whip The Club Head
The wrists now whip the club head down and through the ball. Note this: it is not the rotary shoulder movement nor the downward arm sweeping movement that speeds up the club head. It is the right hand and forearm.
The left shoulder and arm movements merely drag the club handle down to the hitting area.
Hands To Do Their Work
You have arrived at the hitting area when your left wrist is about to come in line with your own head and the ball and while the club head is yet trailing far behind the hands. So I would repeat that the shoulder and arm movements do not whip the club head through, but merely swing the handle end of the club.
It is the hands that whip the club head through.
Golf Fundamentals By Seymour Dunn Grip Must Be Suited To The Individual 1922
Standardized Golf Instruction Seymour Dunn
So do not use too much shoulder and arm power or that will make it impossible for the hands to do their work, which is to speed up the club head and get it through on time. A golfer is no stronger than his hands.
An analysis of moving pictures of leading players reveals the fact that approximately 85 per cent of the speed of the club head is attained by the wrists, 10 per cent by the arms, and only 5 per cent by the shoulders.
As we pointed out before, your shoulders, like a hippopotamus, are slow – what we want is speed, not brute force.
Reference : ‘Standardized Golf Instruction Whip The Clubhead’ Third Edition, Published by Seymour Dunn Queens Plaza Outdoor Golf School 21st Street and 41st Avenue Long Island City, New York, U. S. A. Standardized Golf Instruction In Five Books Copyright 1934 – Seymour Dunn All rights reserved. Fundamental 9. Page 48.
Reference : ‘The correct groove of the swing’ Book V Golf Swing Illustrated – Seymour Dunn.
Reference : ‘Legendary Golf Instruction Series’ “In past segments we have talked about Hogan’s little twist on the backswing, we have talked about laying off the club on the way down and now we are going to talk about the importance of the hitting area, that hitting zone, where the left elbow comes into play” by tombertrand1 The Missing Link to Ben Hogan’s Secret on youtube.com video Uploaded on 11 Feb 2008, ‘Learn the Secret Ben Hogan wouldn’t share’. Now here exactly as written and explained by Seymour Dunn 1922, 1934 of the Dunn’s originally of Musselborough Scotland.
“That the greatest possible speed may be gotten into the ball, concentrate the full force of all these sources of speed upon the ball at the crucial moment in the form of a concentrated hit. If you slash away with all your might you probably will not get as much distance as you would out of a well controlled and snappy hit at the ball.” Seymour Dunn
THE Modern ORIGINAL FUNDAMENTALS OF GOLF
Awaken The Hands By Seymour Dunn
“It has been said that the power which drives a golf ball is centrifugal force. It is not centrifugal force. There are two distinctly different forms of stroke; the old St. Andrews arm swinging sweep in which the club was literally wound around the neck and which was best for the old solid Gutta-Percha ball, and the shorter swing in which the club head is snapped thru the ball by a powerful concentrated hit coming from the wrists. Of course, there must be some arm and shoulder sweep. A short swing composed chiefly of wrist action produces a snap, while a long swinging arm action produces a sweep. The ideal swing is a moderate arm and shoulder sweep plus a terrific wrist snap.”
‘Golf Fundamentals Orthodoxy of Style’ Seymour Dunn 1897, 1907, 1922, 1930, 1934.
“I don’t think the fundamentals will ever change. As far as applying power goes, I wish that I had three right hands! On a full shot you want to hit the ball as hard as you can with your right hand. But this is only half the story. If you hit hard with only the right and let the left go to sleep, you will not only lose much valuable power, you will also run into all the errors that result when the right hand overpowers the left. The average golfer’s problem is not so much a lack of ability as it is a lack of knowing what he should do. The left is a power hand too.”
‘Ben Hogan’s Five Lessons The Modern Fundamentals of Golf’ Ben Hogan 1957.
“When I first began to take a serious interest in golf, the great international hero was amateur Bobby Jones. Jones was then the pure amateur. When I studied Bobby Jones’s swing I found that his hand action was particularly slack and loose. Yet, when people asked him about it, he said there was a buffer action in the swing. He was aware there was a shock at impact. He realized that the ball was ‘shocked’ off the club and that he had to absorb it. He wrote about this, but I do not think that many understood what he meant. In other words, there was in his swing a sort of left hand against the right, a resistance to the right somewhere, and I think people overlooked that, and still do.
Now, when a lot of players today write on the game, they ignore it too. They have been hitting balls for so many years that they do not realize that there is a point in the swing when you have to absorb the shock, to take it in your hands.”
‘Thanks For The Game The Best of Golf with HENRY COTTON’ Henry Cotton 1980.