Just looked at the video and noticed that the clip hooks over the edge of the ring thus reducing the inside dia of the ring - what happens if you have a bird with a thicker leg that attachment is going to cause agony to the bird and it is so bulky that it will catch on anything available and fill with muck - I myself don't use ETS so it is not a problem to me some will be spitting nails during nesting/breeding at least the breakfast will be secure - scrambled eggs ;D ;D