One Arm Accumulator For The Basic Motion
 

Stage One of the Basic Motion Curriculum utilizes only one Power Accumulator (Single Barrel Stroke). And that Accumulator must be an Arm Accumulator: Either the Left Arm (#4 / Pull) or the Right Arm (#1 / Push). The Hand Accumulators -- Left Wrist (Cock and Uncock) and the Left Hand (Turn and Roll) -- are introduced in Stage Two (Acquired Motion).

Should you only use the accumulator for your desired/natural stroke pattern (i.e. #4 for swingers, #1 for hitters) or alternate?

12-5 and Yoda videos
 

Trig
I do the same since i have uploaded "A Lesson with Yoda - Collin Neeman"
video (specially chapter 1,2 and 3)
The video incited me to reread 12-5 chapters.
Right from this time ALL my practice sessions, start as yours and I can attest that you are totally right.
These are not only the best foudations for a solid golf swing, but my short game have really improved +++.
I stil have some problem with 12_5_3 (Pivot , Swivel...). But maybe this will be the subject of a futur post.
Thanks
Pm

So does that mean the Club must be gripped in the cup of the left hand to zero out Accumulator #3? Hmm...that's quite unnatural for me except for putting.

???
 

The book references both accumulator #4 (9th component) and accumulator #1 (12th component). Why did Homer reference both of these accumulators in 12-5-1 if we are only using one?

I believe if you go back and read 12-5-0, it states that 'Where applicable, interpret the items per the basic Stroke Pattern, that is, Hitting or Swinging. Either 12-1 OR 12-2 -- not both atthe same time.

The Basic Motion -- Pull Or Push
 

Either the Left Arm (Pull / Swinging) or the Right Arm (Push / Hitting) is the Active Direct Drive of the Basic Motion Stroke. The other is Passive and supplies merely motion. But, no matter which supplies the Active Direct Drive, the Left Arm swings and the Right Elbow bends.

The Active Direct Drive is the player's choice per the Basic Patterns of 12-1-0 (Hitting) and 12-2-0 (Swinging). A bystander cannot tell which Force (Pull or Push) is being employed. Study 10-11-0-1 and 10-11-0-4.

Why is Pressure Point #2 used in 12-5-1 if there is no Accumulator #2?

Right
 

Got it. Depends if you Hit or Swing! Duh!](*,)

Drag Or Drive -- Pick A Pressure Point
 

For Swingers, with or without Wristcock, the #2 Pressure Point Drag Loads the Secondary Lever (the Club / 6-A-3).

For Hitters, with or without Wristcock, the #3 Pressure Point Drive Loads the entire Primary Lever Assembly (the Left Arm and Club / 6-A-2).