My introduction to taking a movement apart was this watch.. I dropped it...hard, and knocked stuff loose. I figured, if it's broken why not teach myself in the meantime. So the DD3285 was my starter. It came in handy on a Bruce Wayne that I purchased (CF) in that some of the screws, on the top bridge, backed themselves out and one went in the escapement and one lay under the balance wheel. Had I not taken that first one apart, I would not have come close to fixing this one.