Here's a Youtube video above. I have it detached in the video for demonstration. But even when it's attached, I hear the rattle as I drive around. It's coming from the metal snap button.
What's a good way to quiet this thing down?
EDIT:
I found a good solution. I used a tiny piece of kneaded eraser and put it into the hole on the strap end of the snap button. Seems to have silenced it now.
I think you could probably use wax as well.