I HAVE HAD MY ROTORS DRILLED AND BEVELED AT A LOCAL MACHINE SHOP BY A GUY THAT KNOWS HOW TO DO IT CORRECTLY.
1. MAKE SURE AND DRILL BETWEEN COOLING FINS (IF SOME ARE DRILLED THROUGH THE FINS AND SOME ARE NOT, THERE GOES THE BALANCING!)
2. MAKE SURE THEY ARE EVENLY SPACED APART THROUGHOUT THE ROTOR.
3. MAKE SURE THEY ARE THE SAME DISTANCE FROM THE OUTER EDGE!
4. IF YOU ARE GOING TO BEVEL THE HOLES MAKE SURE YOUR BEVEL HAS A STOP SO THEY ARE ALL CONSISTANTLY BEVELED. (IF NOT THERE GOES THE BALANCING!)
5 USE A GOOD CENTER PUNCH AND A PILOT BIT SO HOLES DONT WALK.
IF YOU ARE COMPETENT ENOUGH TO FOLLOW THESE GUIDELINES IS I HAVE , YOU WILL SUCCEED. IF NOT "THERE GOES THE BALANCING)
GOOD LUCK!
