[Yoda]

He drives me crazy with his terminology. Same thing with Hinge Actions- He labels it Hinge Motion in 2-G, but hinge action in 7-10 and 10-10.

Not saying he is wrong- just wouldn't be my view of the ideal way to lay it out for the reader to see the consistencies.

Mike O

The difference between action and motion is the difference between cause and effect.

Mechanically, Hinge Action refers to the physical function of a Hinge, i.e., the blade rotates around its axis (hinge pin) and remains perpendicular to its plane of motion. For golfers, it refers to the function of the Flat Left Wrist through Impact and its ability to duplicate the action of the blade of a hinge.

Hinge Motion, on the other hand, refers to the predictable motion imparted to the Clubface by the Hinge Action. In fact, the Hinge Actions are classified according to the Planes of Motion they impart:

1. Horizontal Hinge Action -- Closing Clubface Motion only;

2. Vertical Hinge Action -- Layback Clubface Motion only;

3. Angled Hinge Action -- simultaneous Closing and Layback Clubface Motion.