About this 3D model

After watching this video on YouTube ( http://youtu.be/287qd4uI7-E ), which looked very convincing to me, I had to make one overbalanced wheel myself to see if I can get it to work... Here's a video of me trying to make it turn... Epic fail! I must have done the design incorrectly or something... if anyone has any idea how to make it work like in the YouTube video, please let me know. Otherwise this thing is just another cool desktop ornament! Thanks