The plastic? trim edge with the piping/rod which inserts into the track is disintegrating. So the rod is detached from the bag about a foot on one end and several inches on the other end. See pics. It's disintegrating into crumbles when handled. The rod itself is solid. Is this fixable by me somehow? I can machine sew - can we buy the trim edge alone (with or without rod) ? Or substitute something else more resistant to sun? The same plastic edge is fine on the underside where it gets no sun. It's a Trimline awning if that matters.