Abstract: A tool for repairing damaged threads within a bore. A generally cylindrically shaped tool body includes a threaded section at its bottom end, and an axial bore extending from a point adjacent the bottom end of the tool body to an upper terminal point in a higher portion of the tool body. The bore is closed off at its bottom end by a disk-shaped wall. A particulate waste entry aperture in the wall surrounding the axial bore is located adjacent the bottom end of the tool body, and an exit aperture is located higher in the tool body. Drive-receiving means is located at the upper end of the tool body. A housing, in which the tool body is rotatably secured with an airtight seal, encloses the portion of the tool body in which the exit aperture is located. The housing provides a space that completely encircles the tool body, and is in communication with the exit aperture at all times. The housing has an outlet opening that can be operatively connected with a conventional suction source and waste disposal system.