Patent ID: 7699718

Claim:
A device for adding weight to a hollow shaft of a hand-held implement, said device comprising: a screw comprising an elongate barrel, at least part of which is threaded, and a cap larger in diameter than said barrel; an upper cylindrical member having an upper surface, a lower surface, and side walls, said upper cylindrical member being slightly smaller in diameter than the inside diameter of said hollow shaft and comprising a first post extending from the lower surface of said upper cylindrical member and being concentric therewith, and a first axial bore, slightly larger in diameter than the barrel of said screw, extending through said upper cylindrical member including through said first post, wherein an upper portion of said first bore is enlarged to receive the cap of said screw; a lower member having an upper surface, a lower surface, and side walls, said lower member being slightly smaller in diameter than the inside diameter of said hollow shaft and comprising a second post larger in diameter than said first post extending from the upper surface of said lower member and being concentric therewith, and a second axial bore, sized and threaded to receive the barrel of said screw, extending through said second post and into said lower member; and an expansion ring slightly smaller in diameter than the inside diameter of said hollow shaft, located between said upper cylindrical member and said lower member, said ring made of a deformable material, and having a third axial bore therethrough sized to fit snugly onto said first post and to expand radially when fit onto said second post; wherein the barrel of said screw extends through said first and third bores and is threaded into said second axial bore, seating the cap of said screw into the enlarged portion of said first axial bore, such that when said device is inserted into said hollow shaft and said screw is tightened, said cylindrical member and said lower member axially compress said ring and cause it to expand radially against the inner wall of said hollow shaft, thereby fixing the position of said device within said shaft.