For those of you that are trying to get rid of those shots that are hit in the heel of the club rather than in the center of the club, it is really important that you understand what causes that. Image if you will a big circle and that the head of the club describes that circle. As it goes back, as it comes down and most particularly at impact, where the head of the club is on the outer edge of that circle. Now the only thing that can cause the ball to be hit on the heel of the club is if the center of that circle moves closer to the outer edge, pushing the heel of the club out into contact with the ball. Or, if you start from a slack measured position and then you extend past that from where you started, that would also cause the ball to be hit on the heel. So we have devised a number of different ways that you can try to get those two thing fixed. That is to try to keep the center of your swing stable, not moving closer to the ball, and then also to try to get measured correctly, both at address and at impact. This will help you get those shots out of the heel and in to the sweet spot of the club.
Chuck Cook is instructor to such PGA Tour greats as Payne Stewart, Tom Kite, and Corey Pavin. He is listed as one of Golf Magazine's Top 100 Teachers and Golf Digest's #9 instructor in the world.