Whenever I rehandle an axe or hatchet, I clean and fit the parts up, slather them in slow cure epoxy, and let them cure for 24hrs. I like to do this in the winter when the wood is drier and smaller. The epoxy keeps the moisture out of the joint so the wood doesn't swell in the summer and shrink in the winter (like wooden furniture). I have never had a head loosen on a tool so treated. A bicycle inner tube stretched over a wooden handle lessens the wear under the head from misstrikes and provides an excellent grip.