my flapper is 8-9 ft off the ground so there was no way to close the catch anyway. I took some #12 bare copper wire and some finer wire and made the flapper heavy on the bottom. I used the fine wire (drilling a few very small holes) to hold the #12 to the flapper and then applied some gorilla glue to the wire. It's been years since that repair and still working. The extra weight on the flapper holds it shut and the fan is plenty strong to open it. Going down the road???I really don't care if it opens/closes then. That RV is a sieve as far as air penetration anyway.