I've used Versa Mend epoxy. It's thinner, plus I warm it in hot water. It will get as thin as water and suck down into a crack. There is a difference between the common "super-glue" at your local hardware store and the industrial quality glues. Even the Lock-tite has different variations. Just as fast set epoxy has less strength than slow set epoxy.
Since the grip area is covered with leather a dowel wouldn't hurt.