How does a pull-back car work? Illustrated teardown

Wow. I love being reminded of stuff like this. Those cars were so cool.

Edit: I took one of these cars apart as a kid to see how it worked. This site brought back a lot of memories. The little coil spring inside the gear. I have to get my hands on one of these now…

I really love this site, it is obivous that the owner puts a lot of effort into this