How do you separate a condenser stuck to a Florence flask?

We were extracting steriods from soybean oil by base hydrolysis and forgot to line them with petrolatum. The base used (KOH or NaOH) has leeched into the glass and it's really stuck there. We tried running it under cool water but it didn't work. We also tried putting oil around the area but not the slightest bit could penetrate the link so it was still impossible to pull them apart. We also tried tapping the area with a wooden rod but that did not work either. We're about to try placing ice inside and somehing warm outside this Monday, but if that doesn't work, what should we do? We have considered breaking the 800ml Pyrex flask to save the expensive bulb condenser but that also risks breaking the condenser. Please help us...