Modular carriage Wheel Tensioner (mbot_xc_p1)

This was remixed because my V-Wheels were less than nominal. Measured about 23.34mm in width - Sourced from Banggood. Even though the originals were tightened all the way, there was a lot of slop.

Changed:
-Moved the wheel mount screw holes up: 1mm.
-Reduced one end of the mounting holes diameter down .3mm (no need for a nut).
-Added built in spacers for the wheel.

See the full Carriage Design - http://www.thingiverse.com/thing:2155251

Thank You _MSA__ for the incredible design.