Eric, I am experiencing failure in the bamboo backings I bought from Franks as well. I asked Wingnut about it last summer at Comptons and he had a one word reply, "Moso." I showed him one of the bows with a failure and he commented that it looked like I had done everything right but the boo just failed. He said it had caused him quite a bit of frustration early in his experience with it. I also mentioned to Paul Norseman over on stickbow what Wingnut had said to me about the failure and he was very defensive about boo from Franks saying he had not had one failure in all the many bows he had built using moso. So there is a range of experience with moso out there and I am sure there are many different factors that contribute to any failure. With as much effort as I put into the making of a bow I want to minimize my heartbreak by getting the best materials I can lay my hands on.
Ken, What did you pay for the Tonkin you got from Wingnut? Any break for quantity? I am in the thick of my bow building season here in Minnesota. David