[Yoda]

At what point on the plane line is the thrust directed to ensure that both
arms straight occurs just past impact?

In the example I gave, what would the angle of the flail be with the
ground when it returned to its fully in line condition?


[Bold by Yoda/Yoda.]

The Follow-Through (8-11) defines the Full Extension of both
Arms, and it does not normally occur "just past Impact."
Instead, what does occur is the Full Extension of the Primary Lever
Assembly -- the Left Arm and Club (the Golfer's Flail) -- as the Right
Elbow remains Bent.

The Point of Thrust necessary to ensure both the above conditions is the Ball
(when its Location agrees with the unique Straightaway Flight requirement of
the Golf Club being used) or alternatively, a compensating Aiming Point
(6-E-2).

Regarding the angle of the Flail with the Ground, Full Extension (Angular
Momentum per 2-K #2) occurs theoretically at Low Point, and the Flail would
be perpendicular (90 degrees) to the Plane Line. However, in practice, the
actual angle to the Plane Line -- the Forward Lean -- is dependent upon (and
therefore determined by) the Shoulder-To-Ball Angle of the Left Arm Flying
Wedge at Impact Fix.