Oops I cracked a racket when stringing. (Only my 20th stringjob or so) The crack was right at the top in the middle, because too much preasure. It was not fully broken, but the carbon is dented/cracked a bit where the top is held into place by the machine (babolat sensor that I can use at a friends') So I'm thinking about using some tool to divide the preasure at the top. Feel free to comment Zynex
use load spreader. it is very essential as the 12 oclock is the weakest part of the frame. you can find them in mybadmintonstore.com