Those are really nice close ups
Place or wrap a wire pointer around the bikes frame. Next to the sprocket.
Spin the tire.
Does the sprocket wobble when compared to the pointer
Tighten the high spots.
Loosen the low spots a little bit.
You need sprocket, rag washer, spokes, rag washer, and finally backing plate.
This can take an hour. If you are not careful.
Super glue the finished work.
Wait, why is there a metal plate and rubber doughnut on the outside of the sprocket? One rubber goes on the inside of the spokes, one on the outside- both on the spoke side of the sprocket.
Spad mentioned that, but it will cause problems if you do not do it this way. Here is a pic from Dax' website.