The PAP is based off of the inital flare ring. Some balls, how ever drilled, can flare more or less, with different ammounts of seperation. When you have a ball that falres alot it could get a little confusing to get the measurement like when there are 5 or more rings. When you throw you spare ball, you still have that inital roll, that would be on the first of many rings on a reactive ball, but it is the only ring. Taking the guess work out of it in a way. The different feel, weight, or hand positions could effect your positive axis point.
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