like I said in my previous post I deal with this problem almost on a daily basis and so do most dealerships. I always get the best results by using textar pads with anti squeal solution on the pad and antisieze on the backs and edges of the pad.that 5mm allen doesn't do anything but keeping the disc from falling on your foot when you remove the lug bolts and calper.good luck...paul

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Paul Roberts
Mercedes Centrum Inc.
Bellevue,WA.