"Negative pin" is bad terminology. The pin to PAP distance is what's important. For a low tracker, say 3 1/2" over X 1" up, layouts with pin to PAP over about 4" are going to end up on the "negative" side of the bridge, but will still be strong FOR THAT BOWLER. On the other hand, for a high tracker, say 5 3/4" over, on the midline, the same pin position would indeed be very weak FOR THAT BOWLER. Forget "negative pin", talk pin to PAP. -- JohnP