How to do the Move the Angles Drill
Take the club to the top of your back swing and notice the angle that you form with your rear wrist and the one that you form with your rear elbow. These angles should be close to 90 degrees. Think of these angles as your power package.
To learn to move these angles with your pivot, simply leave them intact and unwind until your club shaft is parallel to the ground using your hips, back and shoulder muscles. Do this a couple of times to get the feel of moving the angles with your big muscles.
After doing 2 or 3 pumps from the top of the swing, down to where your club is parallel to the ground and back up again, hit a ball without resetting yourself at address.
A lot of repetition is needed here to get the feel of releasing later and at the point of impact.
Soon enough, you feel yourself releasing at the ball or after and gaining power and control over your shots.