Hey Icetink,
Cg's don't really matter as much on an average basis but as Aus states, it can limit your drilling options if the ball has high top as well. The more crucial part of this is where the cg is relative to the line drawn between the pin and mb. Some balls can be more lefty or righty friendly for layout and drilling. (IE. If you want to place mb near val, cg's left of the line are easier to drill and if the mb is placed left of thumb, then the cg is more driller friendly to the right of the line) Hope this helps...
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Rick Leong
Ten Pins Pro Shop
Track Intl. - Amateur/Pro Shop Staff
Vise Inserts Staff