[Daryl]

Does one have to use Single wrist action while applying a hitting technique?

Hitting Alignment. Loading the Primary Lever vs Loading the Secondary Lever.

Vary the Loading Action by Varying the Right Elbow Alignment. See Magic of the Right Forearm. At the End of Start-up, choose either to Pitch the Elbow (Standard Wrist Action) to load the Secondary Lever (Shaft), or raise the Elbow (Single Wrist Action) to Load the Primary Lever (Left Arm and Shaft).

Note that regardless of Loading action or Swinging or Hitting, the Impact Alignments are identical. The Flying Wedges are aligned at Right Angles, the Left Wrist is Flat and Level, the Right Wrist is Bent and Level, the Right Forearm is On-Plane, etc.

Note also, that because the Primary Lever is "Loaded", it cannot Swing (Throwout) although it will and should be pulled. If you make the mistake of trying to swing the Left Arm, the #3 PP will "Un-Load".

Swinging is Harnessing CF. Hitting is Overpowering CF. It's still there, it's no longer a factor.