I roll the window all the way up to form it into place. Then I screw it into place with tiny self tapping screws, then I roll the window down, and work out the buckles with a blunt screw driver and my fingers. It will fight you if you try to work out the buckles prior to screwing down the channels.
Carl


1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission