Mendel90 adapter for herringbone gears

I really wanted to be able to use Triffidhunter's parametric herringbone gears ( http://www.thingiverse.com/thing:10707 ) as recommended by Richrap, but they were just too tall to fit on my X-carriage.
This adapter will raise the Wade's block by 2 mm which is just enough to allow the large gear to fit.
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