Hello fellow stringers, I have a small issue at hand as follows: I strung my friends racket 7 months ago and he broke his strings this week so I restrung. I restrung his racket at 26x28.5 using a 0.68 gauge string on both verticals and horizontals. Surprisingly, he broke on the second day of usage between his 5th and 6th mains from middle. Ok. No biggie. I restring his racket at 26x28.5 again but this time with a 0.7 gauge string on verticals and 0.68 gauge for horizontals. HE BREAKS AT THE SAME SPOT ON A CLEAR FIRST DAY OF USAGE WTF!!!! The string broke on the outside of the frame this time and I don't know if the string is being damaged from scraping the floor (he is not a very careful player) or if he just mishits too much and too hard?? (we play nylon and I know 26 is quite high on nylon) (For reference, I string my own racket 28x31 and it takes me around a month usually to break strings if I am playing hard on both feather and nylon and I hit quite a bit harder than him...) Does anybody have any reasoning they can give for the constant breakages?? Thanks!