Abstract: A device for reducing chattering and vibrations in a rotating disk while opposed surfaces of the disk are being cut with cutting tools on a disk cutting machine. The device includes a pair of laterally spaced elongated rigid arms which have pads carried on the inner ends thereof. A bracket which is attached to the cutting machine has a pair of flanges integral therewith, through which a rod extends pivotally attaching the rigid arms to the bracket. A first resilient member is carried on the rod resiliently biasing the other ends of the arms against the flanges. An adjustable resilient member is carried adjacent the intermediate portion of the arms for forcing the pads carried on the inner end in contact with the surface of the disks.