I have had luck with super glue. The only problem is that the glue doesn't hold for very long (maybe 2 days). In some cases this is just long enough for the xenia to attach. If you are going to use this approach, put the xenia in a low flow area until it attaches. I ahve found that using rubber-bands also works nicely. Just don't put them on to tightly, otherwise it may cut it in half.