Because the upper windshield frame on this car is the wrong one, I took a correct replacement to a glass shop to have glass installed. The glass guy tells me he hasn't been able to figure out how to bend the brass channel to fit. Apparently I'll have to do it myself. I have an idea of how to approach the job, but I'd like to get some suggestions from folks who have done it.
I haven't had to do it myself, but it seems to me the crux of the matter is to constrain the side walls of the channel from moving in or out as you make the bend.
Some kind of plywood sandwich, cut to the desired bend radius, with a slot to match the contour of the channel comes to mind, like this:
You only need to make one bend sandwich, just do one bend at a time while being careful to get the distance between bends right to match your glass. You might have to over-bend a bit to account for spring-back. Be sure to maintain tension on the channel as you pull it around the bend.
Leave the ends of the channel long and let the glass shop cut them to fit.
You probably should anneal the area of the brass channel before bending around the form.
and also anneal it several times during the process. Brass will work-harden very quickly during a forming job like this
Mine came pre-bent, I think I got it from Langs.