#2 and #4 are the pressure points the book advises focus on for swingers. One thing messed me up, I tried to create pressure on those points. The centrifugal force of the swinger will cause pressure to be applied at #2. If you squeeze those last three fingers, you could have problems squaring the club face. I try to make sure it is the swinging motion that puts pressure on those fingers. Monitor pressure points, do not create them artificially.
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