kinda new to the forums so bera with me. Most of the knives ive made are fully hidden tangs, and what i do is, either use a nut or threaded pommel, or heat the tang, preferably with a torch, put on the handle, and rivet the tang into the countersink (or into a head) and that has worked for me. Oh btw the torch gives more concentrated heat than the forge. hope that helped.:D