RE: Black horn material
Oh yea, when you drill them out, you want to tapper the hole. Not just a straight even hole like you get with a standard drill bit. I modified a butterfly bit, by grinding the wings down to where they come to a v at the tip. You can also use arotary rasp bit. If you dont tapper them, you will cut into the hole when you shape the tips or knocks. The end of you bow need to be tappered to a point, just so it fits in the hole. A two part, gap filling epoxy will help in getting it to fit, but you still want to make a nice snugg fit. I just cut out two small blocks from the horn tip. Drilled out a tappered whole in the middle, glued them on, and shapped them on the bow. Im sure there are several ways to skin this cat, this was just the way I did it.