Place a tee in the hole of the butt end of the grip so you are aware of where the butt points in your backswing (in photos 1 & 2 I am using a shaft extension for clarification). It should point between your target line and your toe line in less-than-full-swing wedge shots. Practice several stop-action swings without a ball so you can see where the tee is pointing; keep correcting yourself until you get it right. Your mind and body will eventually get the idea and swing the club correctly without conscious manipulation. Eventually, you must let go and trust your swing.
At the finish position, the tee in the grip should point at your
bellybutton or thereabouts (photo 3). If your arm and hands decelerate
through the ball, the clubhead will pass the hands and probably cause a
fat or thin shot. If his is the case, the tee will point more toward the ground at
the finish. Practice you swing, and hold the finish position for two counts.
Make necessary corrections as go along.
Place the grip end of your club under your left armpit, and place
your hands on the shaft down near the clubhead. Practice swinging back and
forth to feel the sensation that the shoulders, arms, hands, and club swing as one.
This keeps the shoulders form getting left out of the swing. If the shoulders
don't turn toward the target during the finish, the tee cannot point toward your
stomach in the drill above.
Practice half-swing finishes with the clubface facing the sky (photo 3).
Pretend there is a glass of water sitting on it at the finish and try not to
spill it. On the forward swing, do not allow the toe to pass the heel of
the clubhead. The heel leads the toe.
If you have a proper grip yet tend to close the clubface in the backswing,
practice 12 stop-action backswings and make sure the toe of the club
points toward the sky and the leading edge is perpendicular to the ground
(photo 4). The toe leads the heel going back, and the heel leads the toe
going forward and through.