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Sorry. I watched the video and had nothing really constructive to say. The video turned out pretty good. From an iPhone, remember when phones just made phone calls.

From the beginning I thought you were simply looking at if the pressure on the hone changed through out your stroke. Plain and simple. I hope that you still do this. I find just that simple...

That is a very interesting experiment. You could of course video it for you to study after the fact as well. Perhaps even doing it in short segments and taking some notes on what you could see and...