Clubshaft orbit through the impact zone

[O.B.Left]

Luke already alluded to this point.

Analogies, however good are always somewhat flawed. So too with plane boards, rails, benches.

ob

I should add that when using center shafted, face balanced putters; 18" high rails, string lines etc would accurately represent the plane of motion as the shaft plane and the sweet spot plane are the same throughout. I think.

ob