I managed to bust the windshield.
I was not happy with how well I had fitted it into the frame. The new gasket was not seating nicely against the glass all the way around. So I decided to remove it and re-install it. When I originally removed the windshield I simply cut away the rotted old gasket, but this time I wanted to save and re-use the new gasket. So I tried pressing the windshield forward and hoping the gasket would pop free of the opening in the frame. I had it almost there, and I suddenly heard a “pop”, and the glass had cracks all over it. So now I need a another windshield, either new or used. It’s not a total tragedy- the old glass had a lot of pits, and a small bulls-eye right in front of the driver.