Thanks for that. Great pictures.
I started playing golf in 1986. Why? The first nine holes of golf I ever watched on TV was Jack's final round back nine at Augusta! I rememeber the parabolic flight of his second shot into 15, like it was yesterday.
He arches his slightly rolled left wrist to keep the putter lower going back (a move that some great putters demostrated - Bobby Locke, Horton smith, Walter Hagen etc.) This obviously increases his right wrist bend...which moves back to its fix postion at impact...then he allows the left wrist to bend ever so slightly in the follow through...hence the higher club head. Not to rouse the shoulder putees out there but the key to Jack's technique is his quiet shoulders + all the other x factor intangibles that we do not have sufficient instrumentation to quantify!
I seem to remember Jack mentioning in one of his instruction books, or perhaps an article that he would change his elbow position based on one of the following negative tendencies: to punch if he was not making solid impact and push if he was not stroking it on his chosen line. I'm doing a similar thing: punch for longer putts, push for shorter putts...as long as I do not mix shoulders only with arms only!
Thanks again, Sean