[davidmanze]

 Well that's over a day and a half that the couplet sits in acetone and really it doesn't look as if the lens cement is affected by this solvent, although it does look a little less hazy. Other internet advice suggests xylene which is a more volatile solvent to more resistant glues/paints etc.It looks as if this is not Canadian balm, but the epoxy based Vitrelite. In theory pure epoxy has no known solvent!

  If I get nowhere there maybe the next step will be boiling it in water to soften the glue, we are in a softly softly situation here.