Many books and videos say you should keep your hands quiet throughout the swing—all they do is hold on to the club. If there is more to be said, it will be something like, “ … and they transmit the movement of the body to the club.” But that’s about it.
I believe that is true, but they never tell you what “keeping your hands quiet” means. Here is what I think it means.
The right hand, if you play right-handed, or the left hand if you play left-handed, plays a big role in keeping the clubface square from takeaway through impact. We’ll just call it the lower hand.
When you assume your grip, your hands become oriented in a certain position, and your lower hand acquires a feeling of being in that orientation. That feeling is most strongly felt along the top of the thumb and forefinger, as marked in the picture.
If you would rotate the club around the axis of the clubshaft, in either direction, you would notice the lower hand acquires a different feeling. Your grip hasn’t changed, but because the club moved in a certain way and you can now feel that something is different in your lower hand.
When the lower hand rotates away from its address position, since it acts as a proxy for the clubhead, the clubface will no longer be square.
Your ability to detect changes in that orientation during the swing, and keep them from happening, play a large part in keeping the clubface square.
Get out a golf club, take your grip, set up, and swing halfway back. While doing so, rotate your hands slightly clockwise. Fix that position of your hands and return the club to club to the address position. You will find that the clubface is oriented differently from how it was at the start.
Do the same thing again, rotating your hands slightly counter-clockwise. Again, the clubface will be out of square.
Try one more time, but with the feeling in the key part (in terms of this drill) of your lower hand remaining the same. When you return the club to address the clubface should be dead square.
Begin building the awareness of hand orientation into your swing by making slow half-swings. Slowing down helps you concentrate on your lower hand. Do not let your wrists become stiff. Let them hinge as they should. Do not try to keep your lower hand frozen in its address position. It should be relaxed and free to move—you just don’t let it move. Exerting less pressure on the handle with this hand helps, too.
You should also train yourself to mimic the address feeling in the lower hand when it swing through impact.