I was confused at first, wondering what kind a TV has bumper caps. In this case TV = TT. What a lot of people do drill a hole through the cap that correlates to the two slots in the metal bumper. Then take an old wire coat hanger, (the cheap type that your dry cleaning comes on). Cut a piece of it a little longer that the bumper height and bend one end with a 90 elbow (it will look a bit like the number 7). When done slip it into the top hole, and then down through the bottom hole. Presto you have a cheap easy method to lock the bumper caps on.