The good news is, there is now a tiny bit of play in my window. I've been prying the sash away from the jamb to break the caulk. If I can get the corners to break, and if the guy didn't put anything sticky in the pocket, I should be able to get it. If not, there's still the bottlejack.

Ioana: You are persistent, I'll give you that :))

Me: Yes. Most people WILL give me that, I think. Or else I NAG THEM UNTIL THEY DO. LOL