charlee323 -- First, be sure you are getting what you want.  On the drill sheet I looked at, the MC2 locations on the diagram are labeled A, B, C, and D, but the verbal description of the location and reaction are labeled A, B, and C,  The A in the verbal description matches up with the B in the diagram, the B with the C, and the C with the D.  For the C in the verbal description (D on the layout), I would look for a ball with a 3 to 3 1/2 inch pin and 2 to 2 1/2 ounces of top weight.  You are going to have to drill a balance hole for this layout, so other balls would work.  The ball I've recommended will probably end up with about 1 3/4 oz of side weight, which takes a reasonably sized hole to get back to legal.  The finger/thumb weight should be OK.  Be sure the pin ends up in the safe zone (it should).  --  JohnP

charlee323 -- Draw a line from your PAP to your bridge.  Points to the right or above this line are in the "safe" zone.  This mainly is important for high tracking 3/4 rollers to assure that the ball doesn't flare over the finger holes. The following link will take you to the drilling instructions for the Hammer Big Blue.  Scroll to the bottom for a diagram of the safe zone.  

http://www.hammerbowling.com/techcenter/drillinstructions_big_blue.php

-- JohnP