Interesting topic, since i fixed my Z-Axis with some shims from Amazon before i read this thread. I was noticing some severe side play and took apart the V-wheels while i was installing the Dewalt 611 mount on the Z-Axis. The shims corrected the issues with minimal cost and the wheels still roll just fine.
http://www.amazon.com/gp/product/B004K1FFFK
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