I wasn't happy with the bungee cords used to keep the covers in place, so I came up with a different idea. Now I use 10" long pieces of 1/2" thick plastic, 5/8" wide, with a screw fastening it to secure the tops/covers. Wood would work too. I tightened the screws so there is a little pressure when on the covers and the hold-down strip stays in place. I just pick up a little on each end and turn it to cover the covers.