Testing the drive mechanism for the first time, the ball bounces around quite a lot in this video, a few reasons for this;

- The ball is not a perfect sphere, it has a number of indents that result in temporary loss of contact with the drive wheels.

- Transfer bearings intended to guide the ball have not yet been fitted - see holes in end of legs.

- Everything is upside down, gravity does a better job of holding everything together when the heavy bit is on top.

- Got a bit carried away...