The tip overlay can be made from cow or Bison horn-the appearence is identical; but Bison sounds way cool.
Cut on a band saw and flatten the underside by sanding. Rasp or sand the sides to the arrow shape. Use a chainsaw file for the cut outs along the edges and finish with sandpaper working up to 400 grit. The tough part is holding the O/L with your fingers as you are working.
The arrow shape O/L makes a classic final touch to the limb tips. It is like a John Strunk signature. Thanks for asking Dave.
Risto, my son and I make these bows for fun-any bow hunting in Finland?