The sweet spot plane (imagine a line from PP#3 running through the sweet spot of the clubhead and then extending past the clubhead through the ground) can trace a straight plane line.
Hope this helps. It's not the hosel or the "sweet spot of the clubface" instead it's an invisible plane made visible by understanding The Golfing Machine that traces the straight plane line.
The connection between pressure point #3 and the sweet spot is the plane of the sweet spot. This is how #3 traces the straight plane line.
It's a beautiful thing!
Sorting Through the Golf Nut's Catalog.
B-Ray
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Catch ya on the lesson tee.
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