[mb6606]

Can compression even be measured? What machine could do this, super super slo motion camera.

It seems like if you could build a machine to create the hinges and had a way to test it that would be the only way to know beyond the theoretical.

If you can measure swing speed and mass then compression would be the difference in ball speed. So measure ball speed using the same ball and club. I create a higher ball speed with HH than VH but that may not be true for everyone.