[JM 35 Sedan]

It has finally become necessary for me to remove and replace the original glass in the windshield of my '35 fordor sedan. This is an EFV8C/A Rouge Class car so I have avoided making any unnecessary changes but the time has definitely come for reasons of safety and appearance. I've gotten pretty good at removing the windshield assembly from the car and know I need to remove the four little screws on each side of the frame, but how do you get that 77 year old glass out of the frame without breaking the glass or bending the frame? I'm thinking I want to keep this glass as a pattern to use for cutting new glass. Is there anything I can do to the original glass bedding to make it easy to separate the old glass from the frame? I would appreciate any thoughts or personal experience anyone may have on how to do this. Thank you!