Prusa Y-axis belt tensioner

I found it a bit challenging to get the Y-axis belt tension just right by using the belt clamps, so I made this Y-belt tensioner in SketchUp. It allows for more accurate tensioning of the belt using a M3 bolt and captive nut. The design is based on the belt tensioning system used in GregFrost's LM8UU X-Carriage (http://www.thingiverse.com/thing:9869).

The holes have the same spacing as the original belt clamps, so you should be able to simply replace the existing clamps without drilling new h