Interesting stuff Bucket. Gonna try the bend and extend with the left knee and see what happens to the rest of the machine on video.
As an aside that last photo of Tiger and Hogan, which one looks likes it hurts? Hogan's right foot is de weighted , his body has rotated towards the hole, his hands are still in front of his body etc. Sort of like he's swinging the club and letting the club swing him too. Like Fred Astair dancing with a string mop. There is an efficiency and a harmony there.
Well . . . both had surgery on their leg . . . one from a wreck and the other from golf (unless it was from some extracurricular activity recently unearthed) . . . but I'd have to say Eldrick's knee wasn't done any favors by that swing. Who knows . . . I can't even spell gyrokologist.