I really wasn't too worried about it as it just moved a little. There is no knock on mine either. I had helped Larry with his ZRX and didn't notice the front sprocket moving so I thought I would ask. I should have taken the front sprocket off for better cleaning and suspect that I would have found a the sprocket just slid over a splined shaft.
Keep that "they all do that" theme going! It's pretty funny in a smartelic way.
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