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Owen, How do you plan to "drill" the lightening holes in these gears? These gears come in two types -- heat-treated steel or powdered metal -- and both types are hard. Do you have access to special bits that will penetrate these metals, or maybe a laser cutter? You'll need to be careful not to affect the heat-treating of the gears, especially the teeth and the bores.
http://youtu.be/c6wRLJWfjFw?t=47s