Sysmetric Cores....Pin under RF and CG kicked out 1 1/2" to 2" max.
Assymetric Cores....Pin under RF and MB on the VAL and not more than 5" max. from PAP
Rather than using different drillings on balls for different looks, I usually but not always, use the same drilling on different balls to get the different looks.
Works for me.
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Proud Owner of a Track GP2