well, here's what remains of the lock i once tried to turn into a cutaway, then decided to destroy and see what the parts did after the cutaway failed:D
a multitool may not have been the best choice, but it did get it apart.
you can barely see it, but deep down in there is the end of the spring that makes the plug try to rotate back. i think. will confirm/deny after further destruction.
not a very clear picture, but makes discernible the three spools. the thing that interests me most, though, is the pin at the back. you can barely see it here, shows up as two tiny black lines, but there are two grooves (one at each end). i believe this makes this pin a serrated pin, leaving the lock with the configuration of one serrated pin in front, with three spools behind it.
due to an extreme closeup with a webcam, it is distorted, but i was unable to do better. this is the pin i believe to be serrated, but the light distortion exaggerates the width of the ring on the one i think is a serrated pin. the groove in reality is about .25mm wide (half the size of mech. pencil lead).
now, if you look just beyond the fourth chamber, you'll see a pin sticking out. it goes in a slot on the plug and there is currently a discussion about the exact function of the slot and pin on another post, by another member. my view on it has changed, i now believe it is to help hold the plug in the lock. here's the discussion http://www.lockpicking101.com/viewtopic.php?f=8&t=53032&p=391497#p391497
I accepted that I couldn't do it. Then I succeeded just to prove I'm never right. - Spc Lawrence