Hmm. I didn't have that much of a problem. I just reinstalled my windshield a couple of weeks ago. One side I used 1/4" rope, the other side I used #12 automotive wire. I didn't slide in the rope, I just peeled back the rubber flap a little and tucked it in. If there was too much slack, I just pulled it tight at each corner. I laid the assembly up where it goes and started pulling from the top part, working from side to side. Lots of glass cleaner "lube". Working both the rope and, using a radiator hose hook tool, worked the flap over the pinch weld. Every once-in-a-while giving the outside of the assembly a little nudge.
