[JesseK]

This is a great lesson for you guys! It's a real eye-opener to the intricate details in the design of things. Hopefully it won't take too much to fix. While you put it back together, pay attention to the details of how you put the drive train together -- the wheel, their spacing, everything should be a perfect mirror of the other side.

Doing so increases quick maintainability, efficiency, and resolves drive train skew when attempting to drive a straight line.