So you put the rotor on with the sole intention of trying to hit it? Of course you'll be able to damage it if you're deliberately trying to see if you can hit it. I've run dual discs for a total of about... 4 years probably and have only caught the rotor about 3 times, none of which caused any lasting damage to them. And I sidehop to the left. And I ride comps. So yeah, it's isn't a problem in the slightest.