I'm trying to instal the windshield in a 1948 3600. I have put the glass in the rubber seal.

I tried to put all this into the cab using a small rope to pull the rubber over the pinch weld but, the center won't go down all the way or "seat" in place.

Any tips for this would be great. The seal is from Steele Rubber and glass is from a place like Jim Carter if that helps.