Bobman,
1) 2) and 3) are all related to this bearing. Unfortunately I don't have a digi camera.
I will try to describe it as best as I can.
You have 2 metal hubs that fit either side of the spur gear. One hub fits over a small metal pin that goes through the axle.
The other contains a ball bearing. Can you see it?
That bearing will come out.
If the bearing is square in its seat the whole assembly goes together "wonky"
Good Luck!