a little trick i tried once, cut a piece of horn. i used cow horn, heat it in boiling water to get it to bend. put it between two pieces of wood in a clamp. you want it to shape like the limb is. anyways after it dries, thin it down and glue it to that spot. leave it a inch or two of overhang from both sides. after the glue dries you may want to thin it a tad more with a file, then wrap with sinew real good. that trick worked for me on a locust bow a long time ago.