I have an interlocking set of parts (1 and 2) which are used under vacuum. The last time I used it, the interface was wet with a mixture of water and ethanol. When the vacuum was removed, the two parts stayed firmly fused and no amount of force that I can apply can pull them apart. I suspect I will break the glass neck before I break the connection.
Can anyone suggest some tricks I could try to use to unstick them? I have tried heating the interface, which had no effect, and I have tried lubricating it, but the connection is too tight to allow the lubricant to penetrate.