I have a 1965 Starcraft Holiday 18, I'am having an issue with the windshield coming loose and away from the lower window frame in the wind. It's the single windshield with two panes joining together in the center. There is a screw-on clip at the top of the center trim piece and another, strange looking clip that screws on to the lower window trim, then justs seems to hold the glass pane in place with pressure , (it doesn't do, or look like it's supposed to do a good job of that either ! I do wonder what thickness of glass Starcraft used originally, these two window panes have been replaced with 1/8" or 3/16 " plexi. Just the center of the window , (both panes) are coming loose at the center. I do not see any type of hold-down on the interior of the window. Any help would be greatly appreciated !