In 12-3 you'll see that Homer listed extensor action in almost every part of the page. As a hitter, I skip adjusted address by starting at impact fix. Extensor action is what places pressure against the #1 pressure point. The only time that I don't keep pressure against the penny is in the finish. The flying wedges are still assembled, but the pressure isn't the same.

Yoda told me that in 12-3, extensor action could have been added in the adjusted address position, which would support ALWAYS keeping pressure on the penny.(until finish)

Extensor Action And Adjusted Address
 

Luke is right.

Extensor Action -- stretching the Left Arm via the Heel of the Right Hand against the Left Hand thumb -- is indeed present in Adjusted Address (8-3). However, the reason the Mechanical Checklist (12-3) does not stress Extensor Action in that Section (of the Stroke) is that such Action ultimately will Flatten the Swinger's Bent Left Wrist. In which case, with the Left Wrist no longer Bent, Adjusted Address (10-9-A) will have become an Impact Address (10-9-B).

And you cannot be in both at the same time.

So, there you go:

Easy on the Extensor Action in Adjusted Address, boys. But 'let'er rip' in Start Up, because that Bent Left Wrist has got to get Flat...

No later than the Start Down!

Re: Extensor Action And Adjusted Address
 

And all the people said, "AMEN, AMEN, and AMEN."
I once was blind and now I see!!!!!!!!!!!!!!!!!!!!!!!!!

FANTASTIC-a question.Can there be any pulling with the left hand/arm through IMPACT while driving with the right arm?if so does this help flatten the left wrist?this is for a hitters action.

Nope its either pulling or pushing. Pushing against a pulling left arm would jeopardise your precision alignments

I wish someone would have told me that years ago. I used to try to feel #3 and try and drive it. Results were terrible. I gave up on hitting and stayed with swinging which when recently viewed it appeared a mixed mess.

Actually I don't believe I ever really felt #3 correctly till Yoda had me do some drills. Once felt, Once learn, I definitely focus on #1 when setting up to do a hit.

That penny drill should do the trick, simple but really effective.

Damn you guys are good....

Pulling and pushing at the same time?
 

Pulling welds the left arm to the chest, and pushing pushes the left arm off the chest. You can't have both happening at the same time.

"Pulling welds the left arm to the chest, and pushing pushes the left arm off the chest."

You are talking about two different times here. When Hitting, the Left Arm should also be welded to the chest at the point in the Swing that the Left Arm is welded to the chest. Otherwise you've started pushing too soon. The two strokes are supposedly geometrically equivalent.

Pulling and pushing
 

I was assuming he was talking about downstroke, release, and impact, as the swinger maintains #4 in the downstroke. The 4 barrell hitter starts with #4, but the right shoulder becomes a platform in the downstroke from which the right elbow can explode, thus exhausting the pressure in #4.

Additionally, geometric equivalents they are, physical equivalents they are not.

Re: Pulling and pushing at the same time?
 

Validation from Lee Buck's out of print instruction book Groove Your Golf Swing My Way:

LET YOUR LEFT ARM LEAVE YOUR SIDE

To keep your clubhead moving down your flight path a little longer past impact, you must let your left arm leave your left side as you swing through the ball. When this happens correctly you'll feel your right shoulder working under instead of around. The extent that the clubhead can stay on the flight path . . . even a fraction of an inch more extension of on-path movement will improve your chances for starting your shots in the direction you intend.

Straight from some circles the best dag-gone ball strike to walk the planet.

Bucket