JDJones
Member
I installed the snap fastener at 2 places. At the location in the photo and also further up toward the front of the window panel. They help to keep the flap down to prevent high speed air from getting into the cabin through the open gaps and make high pitch whistling sounds. This usually happens when I drive at high speed through the flat deserts and mountain bowls where crosswinds can easily get up to 50+ mph.Been monitoring this thread since I purchased my JL last Spring, and like your solution. I also noticed the metal snap fastener in your first photo, which I assume you installed, and was curious if that had any effect on securing the window as well.
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