How does one apply/maintain extensor acton on the downswing without pushing , overacceleration and throwaway? Easy to do on the backswing via pulling the left thumb. Doesn't work on the downswing.
DDL,
Good question. I've found it's easy to overaccelerate as a swinger when pulling turns into pushing on the downswing. Angled Hinging through impact is a dead giveaway that you are pushing through impact.
That said, Extensor Action is in effect during most of the swing motion 12-3-0, so getting used to managing it is the key. Start by slowing your swing down and learn to keep your right wrist bent, level, and frozen on the downswing while keeping your left wrist uncocking and roll motion loose. No Tension in the left arm, it's just a string you try to keep straight. You may find that slowing your swing actually increases your distances.
Over time, extensor action doesn't feel rigid, tense and quick. The left arm is loose and the right arm is providing just enough pull to keep it straight. It is otherwise passive in most cases. The additional Mass it provides through impact will have the ball sizzling off the face of the club.
I agree with MJ above, when you slow the swing down you have a better opportunity to have an automatic snap release. Reference 6-M-1 for maximum power.