The 2012 Chalet Arrowhead has two vent in the forward roof, one the Fantastic, and one simple crank open. The lid for the crank up one aged, became brittle, and did not survive a hail storm. Replaced it with a "one size fits all" part, and ever since then it opens up when traveling no matter how tight I close it. What are your thoughts on preventing this? My first thought is to install some sort of bungee cord to run across the forward part of the lid on the outside. Drawback to this is that area is hard to reach even with the roofs down and latched. Any ideas on securing from the inside?