Flashlight with generator

While I was at home, I noticed there were some objects that weren't used anymore, so I took one and decided to disassemble it: a flashlight.

I was excited because inside there was a generator of electricity working with the rolling of a wheel, like the system for the light in the bicycle. I was curious to see how it is make and what element are required to. The wires part part was quite simple but at the end I re assemble it, as the elements were few and the cover could be just as a container to not loose them.