The vast majority of all golfers need to work this drill into their transition. The zipper-away drill can kill several birds with one stone, especially issues with early extension, steep shaft angles, and the body outracing the arms.
Players of all skill levels, including tour players, have a tendency to suffer from the issues this drill corrects, and I cannot tell you how many of my students have benefitted from applying it to their swings.
With all of the hip restriction, hip firing, lag holding and handle pulling cliches and methods being taught, nothing gets linked up.
Steep, early extension, under plane, snap hooks, shanks, trailing rear arm, right heel flying, herpes, gingivitis and GAPO (Gorilla Arm Pit Odor) result.
If the target is at 12 o’clock and the ball is at 3 o’clock, at the top of the backswing, the zipper moving away from the ball will go to 10:30…if you draw a straight line from your zipper through your tailbone out to infinity, that’s the direction it goes
Another way to visualize. Target is west and ball is north. Zipper and tailbone go southwest:
This takes the leverage away from the hands in transition so they can’t steepen the shaft or AoA, it doesn’t allow the right hip to fire too early or out to the ball too much, creates room and time for the right arm to link up and gets you into your left heel faster.
What’s the downside? You won’t get as many strokes from better players after your handicap gos down?