I don't know how many Bl bows you have made, but if their is one wood that will test your tillering skills. Bl is it. Heat treat the belly,and trap the back with a good piece of wood, and you can get their. I failed with the first 4 Bl staves I got from one bad tree. The backs either broke, or the belly had frets. I made the 2nd four bows from good Bl. I trapped the back, and heat treated the belly. Then tillered with a Gizmo. I still have 3 of those 4 bows. 2 are sinew backed, and very good shootersand one good self bow. I gave the other one to my son.