http://www.youtube.com/watch?v=J1QaOaxkml8
The full episode is available on Netflix; see Season 13 Episode 6, it's the first part of the show.
The rest of the show covers manufacturing of Teepees, croissants, and rolling luggage

There is some interesting info on manufacturing, views of the heat treating (which they apparently outsource), and there's a cutaway view of how the lock works, but they don't get into the cylinder function at all.