I just used a pair of small needle nose pliers. Held the ring from spinning with a flathead screwdriver, grabbed the other part with the hole, and gently pulled out and down. Once ya get a bit of it out of the slot, you can work it off. To get it on, slide one side into the slot, and the rest just snaps in. Was pretty easy. I mean, you could get the proper tool, but what fun is that?
