Thanks, guys! The first thing I thought was maybe the glass is thicker than spec, (haven't measured it yet), and as for the tape, it looked like the stuff I'd gotten from Classic Parts before, so I didn't doubt that it would work. The new window was from CP, too. I have rtv sitting on my front porch for the next project in line, so I'll use that. Since this is my daily driver, and I've got a little welding job that needs done, which requires my truck to pull my welder, I will be happy to try something rather than the tape, just to get it done without cracking it. I was really pounding on that thing by the time I quit, and the more I hit it, the more worried I was that the next whack would be the one that destroyed it. And thanks, Tim, for the heads up on Restoration Specialties, too. I've never heard of them before now, but will have a tape selection from them in stock "nest time". (I'm sure there will be one) Something kind of odd about this door's window is that it had a crack in it when I bought it. I changed it once, and it cracked again in about the same place, even though it took from last fall till now to do it. I put a new bumper in last time, too, and as far as I can tell, everything is tight in the system (no parts knocking around to hit anything).
Does anyone know where to find the specs on the slide rail?? If I could find a shop print or the dimension spec on what the glass channel's opening is supposed to be, maybe I could solve the problem by opening it up to the required width- or just buy a new one- if that is the problem. Thanks for the replies, gentlemen. I do appreciate it. Lee


"When I rest, I rust"
1951 3100 5 window w/ '56 235