I fabricated a "really" small piece of plastic, and "Super-Glued" it to the top of that stud. This should make it harder for the elastic to slip off. It seems strong enough. I plan to be as gental as possible with it, and hope it stands up to normal use.
Here's a pix of it. (The light colored piece is the glued on tab.)
BTW: I had to replace the rubber band already. I used a regular small rubber band. Seems to work OK.
