Experimental Prusa X-carriage with auto tightening belt

I take my extruder on and off my Prusa to change out the hot ends often. I love Greg’s X carriage, but I find it takes some fiddling to retighten the belts. After seeing this, neat thing http://www.thingiverse.com/thing:16730

I wanted to try to build that concept into the X carriage, and while I was at it, try to reduce the hardware parts count. I tried to utilize the concept of a Drop Clamp which self tightens as strain is put on the wire. My thing is fixed on one side of the x carria