P2 refers to the position of the weight hole acording to the gradient line technique. To perform the technique, you make a line from the bowler's pap to their mb. You then put two points along the line, essentially making three equal segments. The first point, P1 is at the bowler's pap, the second is the dot closest to the pap, the third is the dot closest to the mb, and the fourth is the mass bias. The higher the P number, the more dynamic you are making the core with the weight hole. You can get a better explanation by going to the Morich site.
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