I think Tiger is known for his right hand/arm only practice drill. To me it indicates that he's controlling speed with his #1 accumulator. So I would believe he's more of a hitter with the flatstick.
But surely I could be wrong.....
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Plane-Trace, Lag-Stress, Face-Hinge....how hard can it be
It looks like angle hinge putting style. The shaft looks to be on plane,and the face at right angle to the plane. And to be such a wonderful putter, you know his focus is on the hands, not open-close or inside-square-inside. Just an idea.
I think that he uses a peck minor stroke, stopping his hands at impact an letting the left wrist bend in order to "release the putter". I have herd from some people who work at Mcleans golf academy, and have acces to tons of great info about tour players, that he actually increases the loft of his putter by up to 6 degrees.
I am not sure which acumulator he uses primarily, however in his book how I play golf it shoes that he grips the club under the heel pad of his hand, meaning that he also has some ACC#3 in his putting stroke.
Just shows how great his touch is!
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If the right wrist flattens at or around impact, you will suffer from trajectile disfunction.