I can't tell from your first picture, if you've got the specialized washer with the two holes. If you take that washer off, then take the black plastic collar off, you can see the spring that fits around the shaft. The spring should have an end that pokes outward at the far end, and another end that pokes inward at the near end. On the black collar, there's a nub on one of the gear teeth. That is the gear tooth that goes over the spring end at the far end.