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Wow !
I would have never thought to dynamically balance the disti rotor but it makes good sense. Doesn't seem to be that much weight or mass to worry about on this scale. I do know that later disti rotors often look to be more oblong in shape probably for this reason to achieving better balance.
How did do you balance it? Did you attach the plastic piece and keep removing extra stock until it felt balanced in your drill? Tom can you go into some more detail on your improved rotor set up? I would like to try it out. Thank you.