Is it advisable to restring your racket a day before your tournament? I have just noticed how frayed one particular spot is. I'm worried that if the string breaks in the middle of the match without me realizing it, it can mean lost points. I do have a spare racket with the same made and model & similar tension. If the tension was originally 21 and a half, & I've been using it for 6 months, what tension should I string now? Does using thinner string really give someone with weak smash more power?