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Author Message   Nickon51 Tinkerer Username: Nickon51 Post Number: 123 Registered: 05-2008 Rating: N/A Votes: 0 Posted on Wednesday, February 24, 2010 - 03:48 am:    I think the back plate is part of the shutter body casting. Normally you would remove enough of the main components of the shutter and then lift out the mechanism base plate. Under that are the shutter blades and a plate that separates them from the aperture blades.