[Yoda]

I believe there seems to be a misconception that the Left Hand should be Turned 'On Plane' for Standard Wrist Action (10-18-A). I haven't got the book with me, but I don't think Homer ever mentions Turning the Left Hand On Plane. All he says is that it should be Turned.

Another one I hear a lot is that the Left Hand should be rotated a quater turn / 90 degrees. I don't think Homer ever says that either.

How much should the Left Wrist Turn (for the Swinger)? Anyone got an answer

Per 4-C-2:

"When Turned...the left palm faces directly toward that [selected] Plane."

Per 10-11-0-3:

The quarter turn rotation you mention refers not to the Left Hand, but to the Right Hand and its #3 Pressure Point (meaty part of the right forefinger). And that does not refer to an actual rotation of the Hand, but merely the rotation of the pressure point pressure (from the back to the top of the Clubshaft) during an End Backstroke.