I've done a few classic lenses made using Canadian balsam cement, whereby I was able to separate the lens elements in an oven, wipe off the soft balsam, and clean the surfaces with xylene. Recementing was with UV-cured cement.
Now I have a modern plasmat-design lens (probably 1980s) that I need to recement (I feel that the lens is worth the work). What do you suggest to loosen the bond between the two cemented elements? I have access to the typical solvents (acetone, MEK, toluene, xylene, acetonitrile, THF, etc.) and a nice programmable industrial oven (thanks, NSF!).
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