I go over the complete functionality of both of them, along with complete breakdown of both factory cutaways. If you have ever wondered about the BiLevel wonder no more!
For your viewing pleasure (and to show off my new lense!)
The Medeco M3 and M3B breakdown and complete workings (http://mitchcapper.com/cutaways/factory ... 3-bilevel/)
And of course a teaser picture (my favorite):

Thanks to jk_the_cjer and everyone else!