Many thanks, gentlemen.
Lowell, I filled the cholla with a plumber's epoxy putty, then pushed the tang in to make a hole for it. Then pull the knife back out and let the epoxy set up over night. The next day I coat the tang with regular epoxy, insert it into the handle, put the butt cap on, and peen the tang over it. Tai Goo, a great knife maker from Arizona, like to fill cholla with pine pitch. There are some examples of his on his website.