[vj]

The lie angle of the shaft will not effect the plane angle unless you are utilizing the the plane angle of the putter shaft. Meaning, if you are using left shoulder, turned shoulder, squared shoulder or any of the plane angles listed in 10-6 lie angle will not matter.

Utilizing a bench to learn proper stroke is not necessarily wrong. Again, the precision is knowing what plane angle you are utilizing, and what type of arc that 3 dimensional plane angle inscribes on the ground.

Precision, Precision,