Sorry to hear about mistake...so many things can go wrong when LA'ing that you have to experience before that lesson is learned to watch for. Just mark it up to experience or a lesson learned and sing those blues away while ripping. Sorry this happened but, someone could tell you and you may not even think about it happening until it actually happens and then you understand exactly why you check how top and bottom stitching is going before you get too far along. Mark it up to experience and keep practicing. I know it doesn't make you feel much better about it right now but, it will make you a better LA'er in the long run. Good luck with the learning process... It's a journey