Originally Posted by crawdaddio

No, they use rotating disk tumblers. No spring tension on them at all, no drivers. They rotate to the shear line.
Ever see a 'tibbe' key/lock? Older Jaguars in particular used them, as well as many british safe deposit locks. I'm sure that they have been used on other locks, but those come to mind. Angled cuts to varying depths on the keys correspond to the tumblers. This cylinder/key system was originated in england as far as I know.