from what I understand (never done it) you can get some vail material and rubberband it to a rock with the frag inside. The xenia will attach automatically.
It's kinda difficult to superglue it because it slimes up so bad. I've always used a toothpick, push it through the stock and then pin it into a hole in your rock. It'll attach within a few days. You can also snip the toothpick off short so you don't have a big ole toothpick sticking out...lol.