[Max Impact]

In regard to the last bit .......Im trying to picture that. Do you mean one line is arching and the other is straight ish and you connect them at the far ends in a three dimensional drawing? Or are you talking 2D, plan view? Not being a jerk or anything, I really dont know what you mean but it sounds so simple.

In regard to Horizontal its not just any old amount of face "closing relative to the direction it is traveling". The face via the left hand maintains a vertical relationship to the Horizontal Basic Plane , the ground. It can over done or underdone , the identification of the three Basic Planes bringing precision to the execution.

O.K., thanks. That second bit answers one of my previous questions, which was how much does the clubface rotate during horizontal hinging?

Regarding the other bit, both lines are straight, just like in TGM. My visual explanation was the 2D, on paper, version. For a 3D version, I would say that the two lines are clothes lines in your back yard. If you drape a sheet over the two lines, the sheet is "The D Plane".