Okay. By following all your pics, I have figured out how the mechanism works. The bob on the axle, bumps #1 in Train Nut's list. That causes #9 in the list to catch the center wheel and move it one notch. Mine is not doing that. Must be that the bob is spinning. I will try some superglue on it. If that doesn't work....
I'll be back (I know, I've been quoted by so many).
Jerry