[Mathew]

Mathew is it possible to change the diagram to how you believe it should look for horizontal hinging please?

Well I don't really like a 2 dimensional picture to show this anyhows. The low point should be farther forwards, the curve is also too big. Since this is from an overview - if we have assumed that the lines origination point is from the left shoulder (however in reality, the left shoulder is in motion rather from a stationary point and again it should be further forward), the score lines would be correct to these lines if not taking in the factor of the offsetting the vertical to the horizontal hinge action plane by the degree the clubface needs to be open for impact to cope with the amount of compression for an approximate straightaway ball flight before the ball kicks off the clubface....

However this isn't set in stone either cos the further back the ball is positioned, the more the relationship of the left flying wedge to the horizontal hinge action plane will open the clubface and there is a point where both the clubface positioning and the hinge action plane will be one of the same.