Here's from Ebonite
It is easiest to locate the PAP from a lower flaring ball. I would suggest a spare ball. Clean off the ball with a towel, removing all of the oil rings. Find the part of the lane where there is oil (usually around the 4th arrow) and throw the ball down the lane with your normal release. When the ball comes back, there will be an oil ring. This is your ball track. Trace the ball track with a wax pencil to make it easier to locate. Place the ball in a ball cup (ashtray, etc.) with the ball track side of the ball down. The PAP will be the point that is equidistant from each point of the ball track. Use a tape measure from several points of the ball track until you find the spot that is the same distance from all points of the ball track. This point will be your PAP.
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To verify the location of the PAP, place a piece of thumb tape on this spot and throw a shot down the lane. This spot should stay still throughout the first 25 feet. (Depending on the type of ball)
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To measure the location of the PAP, you will need to be able to find the center of your span. This will be half the distance from the front edge of the thumbhole to the front edge of the fingers. From the center of span, draw a perpendicular line (lets call this line â€Horizontal‘) to the same side of the ball that the PAP is located on. More times than not, this line will not intersect directly with the PAP. You will need to draw a line vertically up (or down in some cases) to the PAP. This â€Vertical‘ line is perpendicular to the â€Horizontal‘ line. This will give you two measurements, horizontal and vertical, to accurately locate the PAP from the center of your span.
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Edited on 6/15/2009 12:23 PM
