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.