Try putting the shoulder frame back in the backstroke and then freezing there and then looking at the spot on the ground behind the ball. This is where the putter head sweetspot will drop to, square, when you simply "allow" the shoulder frame to relax and drop back to level.
Also, if you freeze at the top of the backstroke and ask what would happen to your hands if you simply "allow" the shoulder frame to re-level itself, the answer is that the hands would drop-swing STRAIGHT DOWN and across the tops of the feet. The idea is that the golfer should NOT do anything with the hands except let them drop straight down when the shoulder frame relaxes.
Do this exercise a number of repetitions to get some sense of this happening in a reliable way -- that seems to help the idea of "dropping" the putter.
Cheers!
Geoff Mangum
Putting Theorist and Instructor
Geoff Mangum's PuttingZone http://puttingzone.com
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