despite its inflexible fit, it is an outstanding way to learn the second of the steps - chip - once you can hear the 'click' off the putterface fairly often to always.
It is most useful when thinking of "the head of the hammer" (I'll explain more later, it is a beautiful day, time to go out for a hike)
Also useful for the 'punch draw' shot, and 'full swivel' - the rim of the wheel between the thumb and finger of the right hand, palm facing 'away from center' - using twist away and full extension, (6B1D) and 10-2B as a 'wedge'
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"Support the On Plane Swinging Force in Balance"
"we have no friends, we have no enemies, we have only teachers"
Simplicity buffs, see 5-0, 1-L, 2-0 A and B 10-2-B, 4-D, 6B-1D, 6-B-3-0-1, 6-C-1, 6-E-2
The Tac-Tic Golf Swing Trainor is can be used on the left hand to monitor the FLW and on the right hand to monitor the BRW, It costs about $ 30 and gives great audio feedback.