I was given a Wilson Profile 3.0 to string for someone. I took just a quick look at it when it was given to me, and I didn't notice any cracks or compromises, but I didn't look as carefully as I probably should have. I have a Silent Partner Swing, and after I mounted the racquet, first at the head and then at the throat, I noticed a crack in the throat on the outside of the frame. I'm worried that this is my fault, and I'm wondering what the chances are that I did this by tightening the screw at the throat too tight? A little background: I've strung lots and lots of racquets on the SP Swing, and I always tighten the screws the same -- what I would call considerably snug, but not anywhere near as tight as I could (snug enough that they don't turn any more when I apply gentle/medium force and so that the racquet does not move after having been mounted). It's certainly possible this the frame was weak at that point, and my mounting just put it over the top, and it's even possible that the crack was there and I didn't notice. I did hear a "little something" when I was tightening the screw (which I now realize was probably that crack), but it was pretty early on when I started tightening (not tight enough at that point to have had the racquet mounted securely, I don't think.) I'm not really familiar with this frame. It's a very widebody frame, and appears to be aluminum or some sort of metal(ish) material. What are the odds that someone would crack the frame just from mounting it as I've described? For what it's worth, I did notice that it was strung 1 piece when it was given me to, did not appear to be an ATW pattern, so maybe the frame was weaker from have been strung throat up for most of its life? Dunno, maybe that's a stretch. Anyway, just in case anyone is wondering, I'm telling the guy that it's his call. If he is 100% certain that the frame was in good shape when given to me, I will take his word and I will pay in full for the racquet -- no questions asked. But just for my own piece of mind, I'm wondering what the odds are that this is my fault?