For several decades beginning in the mid-1950s, some Plumb handles were secured with a plastic resin adhesive called Permabond. This red, slightly pliable material is an epoxy blend. When used with hickory handles, the wood was tapered to be a tight fit at the bottom and a very loose fit at the top of the eye, allowing the Permabond to flow around all sides of the wood. No wood or steel wedges were used. More information and a cross section is on Google Patents. If you have never read a patent and its technical language, check it out (a hammer is a "percussive tool"):
US Patent 2850331
US Patent 2850331
For more information, you can read this post from Blade Forums on the same subject:
The same procedure may work on other epoxies.