Hinge action in itself is defined during the impact interval (versus swivel - rotation of the hands)...
I was merely pointing out that it takes alot of talent and feel to actually feel hinge action - again, impact interval.
Wish I had that talent.
Which is why we should practice our swivel and hinge action in super slow motion so our computer can suck in all the correct alignments. In fact, that is the only way I would practice the above. Eventually, these correct alignments will leak into your full speed stroke.
Hinge action is what? Controlling the clubface through the impact interval - which takes what - 1/1000th of a second???
And swivel is the rotation of the hands into and out of the impact interval.
But the true way to practice is to practice the motions relative to the associated plane, no? Just seems like...while I understand and appreciate the concept of hinge action itself...it is inherent in the motion taken relative to the associated plane - vertical, angled, horizontal.