[Yoda]

4-C-2 and 4-C-3 is the action of the wrists which occurs during the swing and especially at the release of power accumulators #3 and #4. Power accumulator#4 is the master accumulator that in itself can be considered the power drive of the body pivot. That pivot controlled by the turn and roll of the wrist position.

Mike,

MJ is referring to Point #4 in my post above, not the #4 Power Accumulator. Here is a reprint of that point:

"4. This time, do not swing your arm back and forth. Instead, keep it still, and twist the forearm. First palm down. Then, palm up. This is a Swivel Action."

In his response to that post, MJ expressed his view of the Swivel:

"I thought #4 was Turning and Rolling, and that Swivel was the gradual, minimal turning and rolling effected by the orbiting arms."

The first part of his statement is true: Anytime the Wrist is Twisting from the Vertical -- Turned to the right or Rolled to the left -- it is Swiveling. Such is the case in the Swinger's Standard Wrist Action (10-18-A). Only when the Wrist is remaining Vertical to one of the Three Basic Planes of Motion -- Horizontal, Vertical or Angled -- is it Hinging. And while a Hinge Action can appear to be Turning and Rolling, the fact is that the Left Wrist is merely remaining Vertical. Therefore, there is no true rotation.

The second part of his statement is incorrect, and I believe it is a misinterpretation of Homer's description (in 2-G) of Single Wrist Action (10-18-C-1/2). Here Homer describes the Feel of Single Wrist Action "one long, slow 'Swivel' from Top to Finish" that occurs when Hinge Action is substituted for Wrist Action. In other words, it is a Hinge Action that is applied during the entire Downstroke instead of only during Impact to Follow-Through. And that Feels like a slow "Swivel." But it is not a Swivel, which is why Homer put the word in quotation marks in his description.

Hence, the pains I took in my prior post to differentiate the two.