I'm not a professional stringer... I string my own racquets with a Klippermate but usually have no problems. I wanted to try Dunlop Black Widow, so I attempted to string it myself... bad idea! This string is the most difficult string I've ever tried. It's razor sharp, and when it came time to tie the first knot, I must have pulled the knot too tight and the string cut into itself. After weaving the first couple of crosses, the string broke! Has anyone had trouble with this string? I'm hesitant to try it again for fear of encountering the same problem. How can you tie a knot with super stiff poly that's razor sharp?