I was driving fast in my Bonnewagon and it sounded like my door was open. While working on the transmission today I noticed that the "U" shaped runner (?) that the glass rides up and down in had fallen down into the door. This is the vertical "U" with fuzz on the inside thing on the inside of the door frame that holds the glass in place and seals it as well. It fell about 4/5 of the way down into the door. It looked raggedy at the top like it had broken off. I was able to grab the end and yank it back up with some difficulty. Once up it seems pretty well stuck there. What is this and how is it supposed to be secured? Glue? Screws?