The Communtator Pack is designed to flatten and polish worn commutators. This restores the armature to run almost as good as new. In some cases better because of the flatness. The kit comes with a hand tool, a Dremel mounting tool, five course disks (#400) for cutting and five fine disks (#1600) for polishing.
Each disk can be mounted on the cutting tools by removing the paper covering the double sided tape beneath. The tool will start cutting the outer portion of the commutator because the inner portion gets worn first due to contact with the brushes.