Use a low/no flaring ball.. ie your plastic spare ball to find the PAP. Stick a piece of white tap somewhere close to where you think your pap is. Now thow your spare ball like throw a normal first shot (same revs and hand release). Watch or have someone watch the ball in the first half of the lane.. if you are on your pap the
tape should stay in one spot. If it moves you are off. Move the
tape a bit.. if it gets worse then move the
tape the other way.. Adjust the
tape till you get a stable spot.. now measure from your center grip.. this is your PAP.
You can confirm this with a definate oil ring and an armadillo.
I like to do both methods to confirm..
Now I do
Track lower on my assymetrical stuff.. don't ask me why..I'm still trying to figure that out..