The odd thing on this one - it seems like something's not connecting. Mamiya lenses make such a satisfying "thunk" when triggered off, and this one does - but nothing happens. So some pieces of the mechanism are moving, but there's a disconnect - which could be a broken and irretrievable part, or just something that needs to be re-attached. Glad I found a replacement, but it's sad the way this gear is aging. After spending a month on my "return" to the darkroom with 35, the giant RB negs were sort of "ahhhh" city. I'm aging as well, so maybe I'm just wanting to put a deposit in my karma account?