Rockhammer,this seems to be one of the most commonly discussed items regarding body glass on these old trucks. Here's a thread I was involved with a while back. Hope it helps.
1950 Chevy Advance Design 3100 in Scotland In the Stovebolt Gallery More pix on Flickr. I've definately got this truck thing in my blood ... my DNA sequence has torque settings "Of all the small nations of this earth,perhaps only the ancient Greeks surpass the Scots in their contribution to mankind" Winston Churchill.