Thanks Dennis, I certainly hope it don't break, time will tell. The clamp just catches the rubber seal midway of the corner, and does not touch the glass in any way. There most certainly is some flex, but I guess with 38 ft its has to have some. I actually did this in June, and it does seem to be working better than I thought. I use the levelers in manual, and a bit more carefully. Never had a unit with levelers before. As long as it continues to work I will be happy. Also like I posted originally this is not for everybody, but does seem to work for me. The Best, Geo