Thanks for the advice guys. I don't know why I said this was a stave, but it is a quad-lam bow so I can't heat it later. I decided to tape one end of the string to one tip across the back, and used the other end on the other tip and just let it go slack slowly. I was easily able to tell where the string was touching the center. Thanks for your help guys! I really hope this bow makes it through. The laminations on this one will look just gorgeous if it doesn't break!