The way you place your hands on the club directly affects the flight of your ball—left-to-right or right-to-left. But I’m not talking about weak grips and strong grips, though they do contribute. There are two points that are much more subtle, yet just as important, and which rarely get talked about.
Most books tell you to put your hands on the handle with the palms facing each other, parallel to each other (left photo, left hand only shown). That can, though, encourage right-to-left ball flight. The reason is that the lower hand can easily push the upper hand sideways, turning the upper hand over, which closes the clubface.
To prevent that, there’s a simple fix. Rotate your upper hand into the lower hand so that it acts something like a buttress (right photo). You end up with a neutral lower hand and a strong upper hand.
The lower hand can push against the upper hand, but because that hand is angled into the lower hand, it’s more difficult for the lower hand to turn the upper hand over. You’ll hit it straight, or maybe get a fade out of it.
The other point regards the location of the thumb on the lower hand. Ben Hogan advised having that thumb and the side of the hand tightly pressed against each other (left photo). Doing this firms up your wrist, which again inhibits the the lower hand from turning over. Goodbye draw, hello fade. This is what Hogan was trying to achieve.
If, though, you leave a gap between the thumb and the side of the hand (right photo), that loosens up the lower wrist, making it more possible for the lower hand to turn over, encouraging a draw flight. Goodbye fade, hello draw.
[Note: In the right-hand photo it looks like the right hand has rotated. It has not. The camera angle changed slightly.]
These two features, the rotation of the upper hand, and the position of the lower thumb, can be used separately or in tandem. You have to experiment to find what works for you.
Let me go over this again:
To promote a draw, (1) place the upper palm parallel to the lower palm, and/or (2) have a gap between the lower thumb and hand.
To promote a fade, (1) rotate the upper hand into the lower palm, and/or (2) rest the lower thumb against the hand.
If you’re at you wit’s end trying to cure unwanted curvature, give these a try.