Juel, on my Excella the wide vinyl trim is held at each end by a pop rivet through a small , blue-painted, aluminum plate, about 1 inch high by half an inch wide. I installed one end of the trim with a plate and rivet, and then ran the whole trim round by folding it in by hand, with assistance from a blunt screwdriver on the thin stiff insert. At the other end I cut it about an inch and a half too long, and let that piece stick out for a couple of weeks. After that time it had shrunk a little, so I trimmed it to length, and riveted in the second plate. No problems after two years. With the thin trim without the plates, I just left them overlength for a couple of weeks before trimming to length. Again, no more shrinkage.Nick.
Nick Crowhurst, Excella 25 1988, Dodge Ram 2500 Cummins Diesel. England in summer, USA in winter.
"The price of freedom is eternal maintenance."