How to reassembe the lens unit cap and parts?

How to reassembe the lens unit cap and parts?

My daughter managed to pull off the cap or end of the lens unit. There were a few parts that came off when she did this. I cannot figure out how to re-assemble this and was looking for some sort of diagram for assistance. Does anyone have anything for this or any directions how to do this? I did not get to see it when she took it off, and I cannot figure out how to the parts arrange back in there.