As I said...the reference point for the Plane Line is the Target Line. Variance to the vertical angle of the plane does not change the location of the Plane Line. As for the rest of your questions...they are good ones. I guess you'll have to wait for the book. The point of this post was simply to share a video of a stroke which traces a straight, square Plane Line.....not to explain everything that I know about the golf stroke.
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