This is a sticky question.  What you have to realize is what creates a MB is a pin out ball 1" +.  So yes Symmetrical cores DO have MB but the strength of this MB is no where near the strength of a MB in an Asymmetrical core.  That is why companies don't mark the MB on their symmetrical cored balls.  Because the MB in an asymmetrical core that determines 10% of the balls reaction only determines maybe 2-4% in a symmetrical core.  This is why we don't mark those.  If you want to use it you can draw a line 6 3/4 inches from the pin through the CG and find that mass.  So to answer your question you don't need to do all that because there already is one.  
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Roger Noordhoek
Technical & Customer
Services Manager
Roto Grip, Inc.

You are absolutely right T-god.  I like your answer better!    I just was trying to help re-state is question because it didn't seem like he knew that all balls have a MB.

Thanks,
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Roger Noordhoek
Technical & Customer
Services Manager
Roto Grip, Inc.