Patent ID: 7650827

Claim:
A tool head, comprising: an arcuate peripheral surface of the tool head comprising a shape conforming to a segment of a cylinder with said cylinder having a predetermined axis running a length of said cylinder; a planar peripheral surface subtending the arcuate peripheral surface, said planar peripheral surface extends perpendicular to said arcuate peripheral surface and is disposed oppositely from a center of an arc, which conforms to said arcuate peripheral surface; a forward axial end face terminating the arcuate peripheral surface and the planar peripheral surface, the forward axial end face includes at least one planar face surface, which extends normal to said predetermined axis; and a rectangular recess being defined by the tool head and axially extending into the tool head in a first direction along said predetermined axis from the forward axial end face, wherein said rectangular recess radially extends openly inward from the arcuate peripheral surface into the tool head in a second direction perpendicular to said predetermined axis, wherein said rectangular recess radially extends completely through said arcuate peripheral surface so that said rectangular recess is oriented opposite said planar peripheral surface, and wherein the arcuate peripheral surface of the tool head extends without interruption from the planar peripheral surface to the rectangular recess.