I'm a left handed tweener, 17.5 mph, 300 rpm. I have the Complete NV drilled Pin just left of center .5" above fingers; CG .5" up and left of grip center; and MB .25" left of my thumb. Ball was 15# w/3" pin. Reaction is long with strong move to pocket. Margin for error is 2 - 6 boards on a medium heavy 40' House shot, down and in, or 2 - 3 boards swinging the ball 20 - 4-5 at the break point.