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The balls are 2mm in diameter. How do I know? Well, I found a bearing supply shop, and asked them to see some of their smallest balls. I bought one 2mm ball and one 3/32" (2.38mm) ball for all of 20 cents. The 3/32" ball was slightly too large to fit in the hole, so I tried the 2mm one, and bingo--a perfect fit. Putting the QR mechanism back together is ...

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