Interesting that you chose the kidney rib, and that you posted after I had posted the answers. This would pose your disagreement with the answers. Interestingly enough, I also would have opted for the metal kidney rib, as I used to find it very useful when throwing, later finding that I only needed it for very few things. As I look at these questions, and the books, I find a lot of things that could stimulate discussion, but as yet I have not had any one argue about answers. Maybe that will come. I am glad that you posted an answer based on your knowledge, which I bow to.