OK, you asked for them, here are a couple of images of the damage to the sprocket:
And here is a second image that shows the shiny spots on the inner bore a little better:
Now here's a bonus. I just ordered the replacement parts from our host yesterday (1/25) and not early in the day either. THEY ARRIVED THIS AFTERNOON! I don't think I've ever had service like that before. I did not select or pay extra for expedited shipping either. The difference between the new parts and the old ones are pretty amazing as well; here are a couple of images of that:
