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and im absolutely sure you didnt :-)
I think you'd see more people making your model if it used standard 8 , 9 or 10 mm steel balls Something like http://www.banggood.com/50pcs-Wheel-Bearing-Balls-from-4568910MM-p-967092.html for example.

I just happen to have some 8mm steel balls in my work shop so ill be scaling your model to suit and ill post a remix