Are you saying that horizontal hinging only applies for small portion of the arc around impact and not the entire swing?
3putt
3putt -Yes!
Once you get to the top left wrist fully cocked ,you do not hinge until after release.If you are swinging using automatic release the Roll is caused by the throw out action of centrifugal force,then at some point the flat left wrist must swivel to finish in order to keep that shaft on plane.
So at takeaway ,body rotation will roll the hands. -clubshaft and #3 pressure point are pointing at the plane line.
When shaft is parallel to the ground it should be parallel to the base of the plane line.
At any point after this until it reaches parallel at the top (if it ever does),then the butt of the club should point at the plane line.
Coming down,butt points at plane until parallel to ground ,when shaft is again parallel to plane.
As soon as the left wrist starts to uncock the shaft then points to the planeline-all the way through impact and followthrough -then at some point you finish swivel-again going parallel to the ground and the plane -after which the butt points at the plane line again .
Don't forget the plane line is INFINTE in both directions -so when the club is close to parallel to the ground-it will be pointing at the plane Miles away from you
Got to go, sorry it was rushed but I'm sure Daryl or Bucket will sort you out