I used to try to clamp the overlays on but I had problems with them slipping out of place when I applied pressure. I take a sharp knife and slice all the rubber bands off when its cured.
I like the toughness and the colors of the sheep horn. It can be anywhere from white to black and swirls of both. Sometimes I leave the rough outer layer on the overlay. That looks pretty cool.
I'm working on the tiller now. I'm still on the long string. Everything is looking good so far.