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Author Message   Johnnyh Tinkerer Username: Johnnyh Post Number: 11 Registered: 06-2009 Rating: N/A Votes: 0 Posted on Tuesday, March 09, 2010 - 05:04 am:    Ah, that's a later model shutter than the one on my 16-20, but it looks very similar to the one on my 12-20. It's a little while since I had that dismantled, but if I remember correctly, the shutter face (accessible after removing both front lens elements) is retained by a ring with serrated edges. It would look a bit like this Prontor:- http://pheugo.com/cameras/index.php?page=prontor&WEBMGR=c860ab990860635c40383e41 19601c63