A new Hogan Book just came out entitled, "Ben Hogan's Magical Device" by Ted Hunt. Hunt holds degrees in Physiology and Human Kinetics, and a doctorate in History.
While I haven't had a chance to read it, I skimmed through it. I believe the magical device is what we refer to here as the Power Package (chapter 6 in TGM) and corresponds with what Ken Venturi said Hogan told him his secret was.
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