Hope this helps >http://www.ehow.com/how_5890823_thread-bell-howell-projector.html
Wow, threading a 16mm projector, reminds me of being a kid on the "geeky projection crew" at Jr. High School... I can still go it with my eyes closed, but need to see it to do it. Sorry I can't help you, but thanks for that memory!
This is a Simple Dialog Demo.