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Author Message   Loosecanon Tinkerer Username: Loosecanon Post Number: 17 Registered: 07-2006 Rating: N/A Votes: 0 Posted on Thursday, December 27, 2007 - 04:55 pm:    I have a Mamiya-Sekor 135mm lens set for the old Mamiya TLR cameras with a non-functioning shutter. Well, to put it more precisely, the shutter has one speed: 1/500. Has anyone here ever serviced these lenses?