[Loren]

A slight correction to a previous post.
Extensor action is never released until the left arm folds in follow-through.
It is established at impact fix using either PP#1 or PP#3.
It is common to lose it, so practice by sticking something in there and swinging without losing it.
Lynn likes a penny. I've heard of people using a blade of grass.
Passive right arm through impact does not mean going along for the ride. It means non-accelerating force.
Extensor action non-accelerating force keeps the right arm under control from start to finish, extends the left arm, promotes the correct closing rate of the clubface and provides support for passive lag pressure associated with wrist cock.
I find it invaluable in crisp chipping and important in push elbow stroke putting as well.