[O.B.Left]

I agree with that.

I've got no idea how to measure it.

Compression isnt needed as part of Trackmans calculations then? Again like Hinge Action, Id imagine that though compression is irrelevant to their calculations, it is anything but irrelevant to the golfer.

There must be a lot of things like that Id imagine ...... things "up stream" of the measurements made by Trackman that though "irrelevant" are still causal. "Causal" , whats happening to me? Golf nut using big words, my apologies to the people who know better.

John my position is that I see the effects of Hinge Action and use them like a tool for a lot of shots. Especially around the green. It'd be a shock to find I could just set the face and alter the plane line to get the same results. A total shock. And what about Steering, Vertical Hinging for a driver say...... Wouldnt golf be a much easier game than it is if that had no adverse effect on the ball?