[O.B.Left]

Ben Hogan absolutely employed Extensor Action. No one kept his Right Arm at 'full stretch' -- given the alignments of the Plane and the Right Forearm Flying Wedge -- better than he. Even into his eighties, his 'long Right Arm' into the Finish was a thing of beauty, and it served as the model for Tiger Woods's Right Arm Finish today.

Homer Kelley named and defined Extensor Action. He identified it, gave it its precision and endowed it with the importance it deserves. But, he was not the first to teach it. In the classics, at least two others come to mind:

Robert MacDonald, Golf, 1927.

Percy Boomer, On Learning Golf, 1946.

I would also add Seymour Dun, Golf Fundamentals, 1922, except that his emphasis on the "stiff" Left Arm was via strong left triceps action, with nary a mention of the right triceps (and its responsibility).

Thanks Yoda

The slack you take up, your lag and your actual slacks are world class too.