Well, maybe if we consider that the #4 Accumulator stores potential power? Then we can consider storage, delivery and its Release.
It's labeled the #4 Accumulator because it's the least one used in Golf. No wonder, because it's the most difficult one to learn.
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Releasing them to seek their in-line condition releases their stored potential. Varying the amount of out-of-line and/or the amount of muscular effort will vary the accumulation of Power that can be Released by the selected Triggering action.
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“Left Arm Power” in any form or amount can still be considered #4 Accumulator Action. Otherwise it actually substitutes for the Pivot to introduce the circular motion required to produce Centrifugal Force.