I thought methylene chloride (found in paint remover) was the proper solvent for balsam and lens cement. That is what I use, last time I did it. I had to soak the doublet for more than a week, at room temp.

Now, if Hasselblad happened to use a more modern UV cured epoxy, then you are stuck (sorry no pun intended). It isn't going to be separated, ever.

http://www.apug.org/forums/archive/i...p/t-71602.html

http://www.optical-cement.com/cement...cementing.html