Ben Hogan said: “Good golf begins with a good grip” and "Grip Research" has a storied history that dates back to the great Harry Martin who created the “Overlap Grip” used ever since. In Short: The "VARDON GRIP" is used by very fine players inclusive of--
Bobby Jones, Walter Hagen, Tommy Armour, Gene Sarazen, Sam Snead, Byron Nelsen, Ben Hogan, Gary Player, Tom Watson, Lee Trevino, John Daly, Fred Couples and many, many others!
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My interest in Grip Research dates way back and continues to be a primary area of study. In this regard, the new “OK" Gun Grip™ is an excellent example of how far we have come in understanding the Power Anatomy involved.
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Essentially, the "Index Fingers" close under the club and the Thumbs and big muscle under it press down like a "Hammer!" -- In Short:
Research suggests it’s the Gun “Hammer” in each hand that secures the club square while the back three fingers of the lead hand and two middle fingers of the trail hand operate just as Mr Hogan suggested.
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I might add that none of the players mentioned above call special attention to the "Hammer" suggested to retain the club Dynamically Square throughout the swing even as research indicates "no other way" for this "BiG Muscle" in the Hands to be engaged.
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As such, I strongly advise players to review Chapter 1 of Five Lessons to gain a clear grasp of the Hogan Grip. Of course, there are other ways the grip is described throughout golf history and students would do well to review. Nevertheless, research suggests the Gun Grip "Hammer" is recommended for serious attention! In Fact: When it comes to delivering "Max-Power" in swing, no muscle is "BIGGER" than the "Policis Longus!" It Keeps The Club Square & Drives Thru Like A Canon! ...DrDom