[okie]

Do you have the book? Study 6-B-1-D. It's a beauty! The left arm is stretched (but not moved) by a below plane pulling action of the right arm through # 1 PP, or #3 PP. This provides structure to the power package made up of the arms and club. Another benefit is that it helps you measure yourself correctly in relation to the ball i.e. helps establish the correct radius

Extensor Action provides.

1. Full extention of the left arm
2. full extention of the right forearm for follow through
3. correct rate of clubhead closing

Happy Hunting