With my few remaining brain cells, I have hopefully figured out this most elusive of phrases, the left hand karate chop. As a swinger, one keeps the left palm face down to the inclined plane, and allows the pivot to swing the left arm in a left hand karate chop motion downplane until the release point, where the left wrist uncocks and the left hand no longer faces down on the inclined plane, but swivels through the impact zone, sequentially.
The problem I had with the above was I was aiming the uncocking left wrist at the ball or aiming point, which I thought one was supposed to do. That meant I was probably tracing the plane line with my left arm.
I think I understand now. One performs the left hand karate chop at the ball, but one aims PP#3 , not the left wrist or left hand . Significant difference since PP#3 and the left wrist are separated by about 5-6 inches. That way, one is tracing the plane line with the right forearm and PP#3 while at the same time perfroming the left hand karate chop motion with the left arm, wrist and hand.
Haven't tried this yet, but I hope this may finally clear up the confusion my body and brain have had with simultaneous and sequential release. I have been unintentionally performing a simultaneous release while swinging. Swinging with one long swivel from the top, where my left hand does not stay palm down to the plane. It immediately rolls at startdown.Not good for swinging.
To sum up, I hope this is correct. Swingers left hand karate chop PP#3 towards the aiming point or inside corner of the ball.