I've always wondered what the mechanism of these 'NATO' type knives looked like. Having made a folder novelty 'comb' knife for a friend, I thought I'd try an OTF (Out The Front) type comb knife as well. As a comb, it would not require a sturdy lock up, but I can't see a sliding mechanism, lock solidly enough for a blade. Can't rap my head around it. Where the heck does the spring go? Any response welcome, especially if it's accompanied by detailed drawings!

check this place out many pics and drawings of inside anatomy of otf's and side open knives.
http://sinza.forumotion.com/switchblades-f1/anatomy-of-a-side-open-switch-blade-t507.htm

veebeek, thanks for the link! I got a lot of info there, but I sure wish the photography was better. It was good enough to know I was in over my head.:(