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Author Message   Steve_s Tinkerer Username: Steve_s Post Number: 174 Registered: 07-2006 Rating: N/A Votes: 0 Posted on Sunday, November 28, 2010 - 12:44 am:    I have a couple of Exakta mount Tessars which look outwardly the same as yours. Each of mine is constructed slightly differently - see pictures below: - In both cases you start by removing the outer retaining-ring at the back, and the complete optical/aperture assembly, with the focus setting spacer ring, comes out from the front.