The Tally is sort of like a dowel strapped to your left arm. The Left Arm Flying Wedge remains intact as long as the left wrist is flat or vice versa. Homer said that if you could maintain a flat left wrist and swing through the shot (instead of at the ball, impact not being a destination or a Station, let the motion make the shot, no steering etc) .......... you didnt need his yellow book! But alas its easier said than done for most of us, even a lot of good golfers.