I recently strung up my second racket and I think pulled the initial knot too tight or just shouldn't have tried to pull the VS at 63 lbs, but the knot popped after a few hits. I have another racket strung and don't plan to use that one unless it's absolutely necessary, but I'm wondering if I would damage the frame to try and use that racket as a backup. I'm talking about if I had a match and broke a string in the good one, if it would be bad to finish the match with that racket then re-string them both. I feel bad completely wasting a set of strings, but I wouldn't want to jeopardize my new racket. It's the top cross string, and the rest of the strings (even the cross below) are holding their tension just fine. Also, do any of you have advice on the problem I'm having stringing this? It's the second time I've done done this with this racket (the one with Hurricane in the mains. I can only guess that I'm pulling that first knot too tightly, but also done this twice before on other babolat rackets when doing a two-piece setup. No problem on Wilson or other rackets. I'm not blaming Babolat, it's just that whatever I'm doing doesn't work with their frames. EDIT: After doing a little bit of research, I can explain that the first time I strung the racket I tried the double-stitch, and the second a modified double-stitch where I reverse the knot the second time. The knot was still on the main string in both instances though, it snapped between the knot and where the string enters the grommet.