Originally Posted by saevel25
i'm not sure, its not something i thought about, but i am going to take a guess. The bow and cupping of the wrist don't cause as much open and face closing as the forearms but they do. grip the club with your left hand, take your stance, and then keeping your left arm still (hold it with the right hand if you can't), just cup and bow the wrist. You see that the clubface moves laterally down the line, not around the body. Now for regards to open and closing a clubface, think of this on the golf plane, that moves around your body. If you at impact, you add loft, but you also change the impact position along the arc, meaning the clubface relative to your swing path will now be open compared to if you didn't. If you bow your left wrist, you change your impact position, and the clubface will be closed.
So really its just something you have to be concious about in the swing. I believe i heard announces say Dustin Johnson, who bows his left wrist, has to hold off rotating the clubface through because if he does he will duck hook the ball.
I'm sure it all makes sense, saevel, but i didn't understand this bit.
I've been playing around with it in front of a mirror and have some new thoughts. It strikes me that cupping the wrist during the backswing changes the shaft plane. Specifically, it gets steeper, so that at the top of the backswing you are above the plane. So you come down over the top, approaching impact on an out-to-in path, and so you have to open the clubface relative to this path to square the face to target. Hence a fade/slice.
Similarly, if you bow the wrist during the backswing, this flattens the shaft plane, so at the top of the backswing your bowed left wrist puts the shaft under the plane. From here you approach impact from the inside, on an in-to-out plane, and so you have to close the face relative to this path in order to square the face to the target. Hence a draw/hook.
In summary, i'm wondering if it is the effect on the shaft plane more than the effect on the face of cupping/bowing during the backswing, that leads to compensatory adjustments to the face (opening or closing it) at impact.