If I am thinking of the same screw that you are referring to........... it adjusts the front to back alignment of the side window by placing the angle of the front glass channel. I guess that by default it would also align the vent window frame with the A-pillar. We talkin' the same lingo, brother? L8r
Thanks gerahead, that sounds right. For some reason on my car adjusting it in or out makes no noticeable difference in how the glass lays. I guess I will just tighten it up and leave it alone. Thanks again.