Technically speaking I believe 90 degrees is a horizontal hinges. Where as anything from 1 to 89 degress can be considered an angle hinge with the ideal being a 45 degree angle.
Easier to create a more predictable ball flight.
I'm not TGM certified so don't take this as the holy grail.
Sorting Through the Duffer's Bible.
B-Ray
By the way 12 Piece I was dissapointed I didn't get to meet you at Campbell a couple weeks ago.
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