I would love to see a video or photographic walk through of the dissassmbly and assembly of an Omega 861 (Early Speedmaster). I have to restore my personal Speedmaster (given to me new in 1974 by my parents). I have worked on several chronographs in the past but with guidance from books or videos but I would be much more at ease with visual guidance. I looked everywhere for the 861 takedown and couldn't find any detailed work. I also searched for the similar Lemania 1873.