Symmetrical layouts

Question
Chip,

I've got a severe mental block going on in my head regarding symmetrical layouts.  Since no MB is marked, I've read other "experts" say that you can layout a symmetrical ball like you would an asymmetrical, just use the CG as the reference instead of the MB.  I understand a layout of 4 X 4 X 3 on a ball with the MB marked, but how would I do that with only the CG marked?  Some "experts" say to just draw a line from pin through CG for 6.75 inches and that will be the MB, while others say that won't work.  As an example:  If I was told that in order to achieve a certain reaction from my ball, I would need to place the CG near my thumb....  I'm OK with that suggestion, but if the distance from pin to CG was very short from the factory, say 1.5 inches, then that would put my pin below the midline and wouldn't that then change the balls reaction for the first 40 or so feet?  To me, I would want the pin above midline at some length from PAP with a certain buffer length, but if I do that...the CG also moves up and destroys the placement near the thumb hole.  What am I missing?  Please help me understand this, I'm just trying to learn a little bit about layouts and this mental block is killing me.  :-)

Answer
Some layouts just can not be used with certain balls.  Short pins are very limited.
It is true that you can use assymetrical layouts with symmetrical cores by drawing through the pin and marking the 6 3/4 spot.  This only works with balls that are at least 2 inch pins.  You are seeing and thinking clearly.  I usually try to order balls that are 3 to 3 1/2 inch pins distances.  They are the most versatile.  For some of the really exotic layouts, I look for balls with 4 to 5 inch pins.

Good luck,
Chip

Sorry for the delay.  I forgot to put my vacation dates on the website