I'm making a mallet with a wood face on one side, Delrin (a type of acetal plastic) on the other. Delrin is very slippery and doesn't glue well so I can't depend on adhesives. My plan is to join them with a round mortise and tenon. Pre-drill a hole through the Delrin, run a deck screw through it into the wood then plug the hole with another piece of Delrin; but Delrin can only be bonded to itself with special adhesives. Another option would be to pin them together but I would prefer not to have a pin visible. One last option I can think of would be to groove the mortise and tenons and rely on epoxy to form a mechanical bond but I'm afraid hammering will shear the epoxy. Thoughts or suggestions?