Per Tom Tomasello's instruction...Tom says Homer is telling you how to start the club down in section "6-B-2-0 The Second Power Accumulator"...where Homer says, "Centrifugal Force, Accumulator #1, and the muscles of both forearms, any--or all--are available to actuate this assembly."
DG, I was merely responding to your words above. If this is not representative of Toms beliefs about Startdown then the misinterpretation is not mine, (for a change).
I have no problems with an arm centric perception of things. Im a bit of an arm swinger myself. The quarterback firing a long bomb throw is probably not thinking about his pivot for instance. But that doesnt mean that his arm precedes his pivot actually, sequentially. Homer is very clear that Startdown is the period of Right Shoulder acceleration. The period of Arm/Hand acceleration is later, sequentially. Hogan in the Shell's WW of Golf tape traces this move of the Shoulders (and Arms together, fully loaded Power Package) back to the movement of "the lower body". This all relates to the best drill in golf, to my mind, the Startdown Waggle.