Hi there — I’m hoping that someone out there has seen something similar to what I’ve circled in this photo of our car from 1971. The windscreen frame has 4 screw holes in at at both attachment locations, and I think these were some kind of way to lock open or closed the lower side of the windscreen. Right now it rattles something awful when driving down our pothole-strewn Michigan roadways, and I’d hate to get a crack in the glass again! Thanks for any ideas or advice on this…