Ben Hogan's Five Lessons: The Modern Fundamentals of Golf

The grip of the right hand, since it is the hand that does the overlapping, is more complicated. If setting up a strong, correct left hand is one half of the job of establishing a one-unit grip, the other half is getting your right hand in a position to perform its share of the work but no more than its equal share. This means, in effect, subduing the natural tendency of the right forefinger and thumb to take charge. If they do, they'll ruin you. The "pincer fingers," the forefinger and thumb, are wonderful for performing countless tasks in daily living such as opening doors and picking up coffee cups, but they are no good at all in helping you to build a good grip and a good swing. The explanation behind this is that the muscles of the right forefinger and thumb connect with the very powerful set of muscles that run along the outside of the right arm and elbow to the right shoulder. If you work the tips of the thumb and forefinger together and apply any considerable amount of pressure, you automatically activate those muscles of the right arm and shoulder — and those are not the muscles you want to use in the golf swing. Using them is what breeds so many golfers who never swing with both hands working together, who lurch back and then lurch into the ball, all right arm and right shoulder and all wrong.