Tim-
I can't speak for everyone else, but I use an adhesive called "zap a gap". It is basically super glue, but it will lock the eyes on. I then wrap over the dumbell for added strength.
-Rich
Ya, What he said! I make a X wraps over the dumbbell, Then put a drop of Zap -A-Gap on it and let dry. Then tie over top of that. Then you have to Epoxy the head when done. This was my first go round with epoxy also !