Stabilizer/Anit-Slip for IKEA DAGOTTO Feet Rest

I bought the IKEA Feetrest and it don't took long until it started sliding around.
The rubber-tubes wont stay in place and turn around. so the footrest is anything else than stable :/

So i designed this things.
they fit onto the corners of the pipes. Just slip the rubber tubes on them and it will hold them perfectly! They wont rotate or slip at all anymore! Now the footrest ist perfectly stationary!

I will add pictures of the things attached later.