I had done a shark fin piece once before with a smoothish grey shape on one side and white teeth on the other. I have a girl who comes and welds on a Tuesday and she made a piece using teeth on a tooth. It did look good but she took it apart after a while and left the teeth in the pile. I had seen another deign somewhere of a triangle covered with smaller triangles and this also had a part, I made more teeth, incorporated the fin shape into the moth and used another piece from the pile as a base