Mercedes spec rotors are not designed to be turned. They are thin, by design, and don't have enough material to lathe off. That is not to say they can't be turned, but you will introduce a whole new set of problems if you do. Just buy new ones. They are cheap and you have the priceless peace of mind that you did something to spec.

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"Fubu" - 1993 500E 199/271 (103K) 124.036
"Patty" - 1994 E320 Touring "Sportline" 172/174 (239K) 124.092
"Punch" - 1997 Porsche 993TT (34K) Hang on!