I've been running twin disc on my czar mod for almos one year now. I managed to hit my rotor three times, but never managed to destroy it. It was always a two minutes job to fix it, bent it back a little. Im not even a good rider. I cant really imagine how can one destroy a rotor in one day, or hit it so much that it bents that much. The only thing what you have to do when doing sidehops, that you stand at an angle to the wall, so when you mess up a jump the chain stays will hit the wall and not the rotor. But what am i saying, this is the correct technique or at least thats how the pros doing it.