Dunesman
Well-known member
Certainly, that shows it very clearly. If putting had to be done with some sort of a frame with low friction free pivoting of of the shaft, then zero torque putters are unquestionably the way to go.
I have never seen any one use one playing golf though, and they are probably illegal. Holding the grip in non slip hands seems a more elegant solution than using such a contraption, and then needing a putter design to counteract the weakness introduced by that contraption.