I HAVE A 1993 500SEL WITH 95,000 MILES.

I HAD MY CRACKED FLEX DISK (FRONT) REPLACED, NOW I HAVE A VIBRATION AT SPEEDS OVER 50MPH.

THE PART NUMBER OF THE OLD DISK IS 129 411 00 15.THE NEW PART NUMBER IS 129 410 01 15. BOTH UNITS LOOK THE SAME. ONLY DIFFERENCE IS THE BOLT HEADS. THE OLD ONE HAD SOCKET HEADS AND THE NEW ONE IS A ALLEN HEAD.

WHAT COULD HAVE HAPPENED? DO THE BOLTS HAVE TO BE TIGHTENED IN A CERTAIN ORDER AND TORQUED? THE MECHANIC INSTALLED THEM WITH A AIR GUN.

ANY HELP WILL BE GREATLY APPRECIATED.