ive turned the rotor so i can get to the screw like 5 time in the past 2 days. its not difficult. but if you wanna take some stress out on the rotor for having to replace it go ahead. Turning the rotor only takes a few seconds either do it in short increments or have someone watch it for you. breaking it off is fine but i just want everyone to know that its not difficult to get the screw in the correct spot.