An improved tool for attenuating vibration in a disk brake rotor during the machining (or facing) thereof using a disk brake lathe is described. In its most basic form, embodiments of the tool comprise a pair of substantially linear and parallel spaced apart legs that are fixedly coupled together by way of a coupling section proximate their proximal ends and have opposing pads attached to the opposing distal ends. An adjustable clamping mechanism is also provided through which the distance between the legs can be varied and/or the biasing force applied against opposing brake rotor surfaces can be varied by way of the legs acting through the pads.