I had the same problem. This might sound stupid and redneck but take a rubber mallet and tap the center of the wheel a few times. They seem to get a little bound up. I found this out of dumb luck. I had this happen to mine and I was so pissed that I couldnt get it to work that I hit it with the palm of my hand out of frustration and it worked! My friends had the same problem and I fixed it with a rubber mallet! Hope that helps!