I'm still wondering how its done! I got a tight fit with the slot so there isnt any play to start with and shaped it to about 90% before attaching, rough traced the outline and cut it down with a bandsaw. Then put a coat of layout fluid on and scribed around the antler filing down closer each time, had to repeat that about seven or eight times. That got pretty close, now that its attached, I'm trying to match it up with the antler so it's smooth like in your picture (sweet knife by the way). If it was smooth antler it would be a lot easier, but avoiding all of the ridges with a file is proving to be a pain in the butt. I know one thing, I appreciate seeing fitted caps like that even more now!