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Author Message   Mikeguyver Tinkerer Username: Mikeguyver Post Number: 3 Registered: 08-2007 Rating: N/A Votes: 0 Posted on Saturday, September 22, 2007 - 02:35 pm:    I just purchased an Mamiya rb67 127 mm lens with a Seiko shutter. I am trying to disassemble the lens starting with unscrewing the front ring so I can unscrew the front lens assy. The ring will turn a few times and stop. Is this suppose to happen or the ring thread is damage?