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Just now working on a quite rusty '39 windshield frame that wouldn't budge with soaking, heat, and so forth. Finally resorted to a jeweler's saw to cut the two halves apart. This works quite well, and removes almost no material from the frame itself.
Drilling out the remains of the connecting bars, on the other hand, is not much fun. But it works. Just thought I'd mention this approach as a last resort, and hope you won't have to go there!