I usually like to use my center D as my attachment point for both caribiners in my climbing system, but recently I have been trying the Petzl Swivel. I have it attached to a piece of 1/2" rope that runs between the two side loop attachment points on either side of the center "D". It slides nice and serves the purpose but there isn't really enough room for 2 biners. Does anyone else use it? How do you incorporate it into your system?