NWFC's expansion is using Favero floor reels, rather than overheads; the medium pizza-box type. As we all know, even though these things weigh 10 lbs. and have decent rubber feet, they walk. People kick them, they get pulled around by the act of fencing, and for all I know, they scurry about like mice overnight. All I know for sure is that they do not stay where you place them. Here's my solution. The piece is the same 5mm height as the feet, and constrains lateral motion while allowing instant replacement if a box goes bad during a tournament. The shape is designed to avoid the rivets and screws on the bottom of the box so it sits flat and fully supported. One could use a single piece placed across the front of the box, or two pieces along the sides, as shown. If a box is missing a foot, as this one is, two pieces will hold the box level and in place. I can make these up if anyone needs them, but will probably wind up posting it online for anyone to use in the future.