Wtf, are you being serious? Sounds like you could risk damaging the frame. See vid at around 3:45: https://www.youtube.com/watch?v=JMBqPbLrZMA
Tennis rackets aren't as strong as you might think. Way back when I was in HS some guy tried to hit a basketball with his racket and the head snapped off. Take the loss of 1 string job or risk the cost of 1 new frame, its up to you.