[Yoda]

Pull your Left Arm straight by using your Right Forefinger and Thumb. That's the Pressure Point #3 application of Extensor Action. It pulls the whole of your Primary Lever Assembly (the Left Arm and Club) taut, which may inhibit Left Wrist Cock.

Tongzilla is correct in his response regarding the use of Pressure Point #3 to create Extensor Action, especially his comment regarding inhibiting the Left Wrist Cock.

Personally, except for Extensor Action Takewaway, I find it much easier to create (and teach) Extensor Action using Pressure Point #1 (the heel of the Right Hand pushing against the Left Hand thumb).

It is particularly effective to feel this 'Right Arm Pushaway / Left Arm Stretch' at the Top. Practice daily the Start Down Waggle while applying Extensor Action 'Push / Stretch'. The combination of the two is the first Check Item at the Top in the Mechanical Checklist For All Strokes (12-3 / Section 6).