I usually wrap the layer of bucktail the length of the shank to give a nice flat layer. Then, I lay a slim line of superglue along the shank. I then wrap the flashabou or whatever else I have around trying to move the superglue with the wraps. It makes for a pretty good connection, and as the flashabou frays from use, it becomes like a dubbed body. You could run some mono over it, or even a light coating of softex or maybe even epoxy. Haven't tried either, but that gets me thinking...
Hope that helps.