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Hi. Need to open burnished doublet of Summitar 50mm f2.0 lens, then clean and re-cement doublet. If you like fun projects, this is the Winner!! Leica do I hear you responding? Anyone know of who can do this? Photos of opened Summitar Lens: http://rangefinderforum.com/forums/showpost.php?p=2570890&postcount=54 Note: Tried boiling Front Lens Group to open the outer ring housing containing the doublet. Now, need to CLA lens: reapply anti-reflective paint / front lens coating. Reference: Boiling Lens - http://tinyurl.com/z93tt2b Glass is super clean now - except for the doublet that has white splotches from melted balsam.