Pin above finger foles: ball will skid longer. Good for dry to medium conditions.
Pin below finger holes: ball will break and roll earlier, better suited for oily conditions
Pin outside of finger holes (to the righ for righties): sharper reaction, gives a nice combo with pin above finger holes layout.
Additionally, an X-hole can influnece the reaction or can be used to fine-tune. It might also be necessary to make balls with a strong pin placement outside of the finger holes legal.
Besides, the distance pin to CG is something different, determining the distance between the actual top of the core (which the pin marks) to the center of gravity, the point from which all the ball weights are equally distributed. Pin-out distance can give you insights on how the ball might react when drilled properly. Check out other posts in this forum or the brilliant FAQ section.
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DizzyFugu --- Reporting from Germany
Team "X" league website: http://homepage.mac.com/timlinked/
"All that we see or seem, is but a dream within a dream..." - Edgar Allen Poe