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Cross drilling rotors



I'm about to set up my brake rotors in the mill to cross drill them  I have 
read in _Tune To Win_ about hole patterns, and slotting, etc.   What I'm 
unsure about, is what size to make the holes.   Can someone who has some 
rotors that are cross-drilled, or who has drilled some in the past, please 
tell me what size hole they used?   If nothing else, .1875" (3/16) looks 
"'bout" right.

Thanks,
Erik Frank