[BerntR]

OK, let me see if I can sing along and get the meaning of the words.

A- The "single shift-prepared to roll" does not reveal the on-plane right forearm which is important.

Don't understand what you try to say here

In effect, if my right forearm starts on plane, so does my elbow (?).

Naturally

B- If that premise is correct, when my forearms trace the inclined plane, doesn't my right elbow fall below and parallel to the sweet spot plane of necessity ( as Bernt R states)?¨

If you try to trace the inclined plane with your forearms your pivot will get in the way of your hands and vice versa. Tracing the plane with your clubshaft (and therefore the hands) is what you want to do. Not the forearms, not the elbows, not the shoulders.

Your left forarm is above the plane from address and a long way into the follow thru. Your right forearm will be under the plane between address and impact. The only things that really are on plane here are the club and the forces you swing it with.

Drum roll for the ending of one of my misunderstandings...So, the only way we can effectively put the right elbow back on the sweetspot plane is by extenging the right arm/elbow in our desired approach?

You don't have to do anything deliberate to put the right elbow back on plane. And if you should strike the ball before it's back that wouldn't be such a big deal either. It is when the elbow gets above the plane that you are in trouble.

C- If the above is a correct observation, my Jim Hardy type failure to rotate the right/left wedges (lawn mower move) means possibly, 1) a failure to roll due to a stuck elbow showing tension for whatever silly swing thought 2) an off-plane back shoulder movement, 3) a strange misrepresentaton of a Horizontal Hinge (like Orcs were strange misrepresentations of the race of men, ogres to dwarfs, and something else to elves according to Tolkien's notes).

He-he. Good one.

Here's how I do my vertical hinge: I wait with the pivot and swing my hands forward and eventually past the pivot so there's minim lag beetween hands and shoulders at impact. A very gradual, slow and almost amputed release of accumulator #3. And I try to maintain good hands speed to past low point. That keeps the clubface open.

For a horizontal hinge I do the opposite. I let the pivot lead and pull the arms through. I find it easier to accomplish this with more hip turn. And to the extent that I do any roll with the forearms it is in the opposite direction for a while - to keep the clubface open longer and delay the hinge action as long as possible. And when the time is right I let Accumulator #3 release. The A#3 release is the part where the club head goes from open and trailing to closed and leading. The hands speed is very moderate when that happens. The rate of forearm rotation can be very quick.

Centrifugal force will do it for you. But you must let your hands work like a passive hinge to make it work.

The more I lead with the pivot, the more I trail with the hands and the longer I keep the cluface open before A #3 is released - the more dual horizontal it gets. It is very important to keep the left arm stretched throughout, while at the same time keeping thos hinges oily. Pure rope handling + oily hinges.

No deliberately hands and forearm effort to square up the club. It may be very counterintuitive to begin with.

There's a lot of light bulb material in letting the dual horizontal happen. A key to move past steering tendencies lies there.

D- I don't have a clue as to how you fellas use a Horiz. Hinge to hit a controllable, mostly straight sort of draw. When I try the HH, I hit a ball that goes 2/3'ds straight and 1/3 rd left with any club.

Could be all sorts of reasons for that.

First: Check your grip. If it's too strong the ball will turn left.

Perhaps you are bending the plane. And steering. And bringing your right elbow above the plane you were supposed to swing along - thus bringing your hands and your club outside the intended plane and back in for an outside to in swing.