I've never done one but I would drill holes and use alu. dowels to secure together. First I would figure out how you want them to go together and how the cord would run with the least amount of visibility. Then you actually have to cut a groove in the antler, stuff cord then refill with epoxy or something similar. As the epoxy dries, texture to match existing antler. So you will have to stain the cut areas, just don't overdo it. They sell kits I think but again I have never done one so I am only doing a guestimation. Hope it helps