I know this comes up all the time, about people trying to drill their own balls, or somehow build something to drill balls.  

I ran across this thread, and found it slightly humorous - something about machinists trying to build a ball jig, and then some others trying to describe bowling balls.

http://www.practicalmachinist.com/cgi-bin/ubbcgi/ultimatebb.cgi?ubb=get_topic;f=30;t=001116;p=0
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