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A device for holding a piece in a bore comprises a cylindrical sleeve constructed to be inserted into the bore and held therein by engagement of its outer surface with an inner surface of the bore, and an annular bead extending circumferentially and inwardly from the inner surface of the sleeve, the

A device for holding a piece in a bore comprises a cylindrical sleeve constructed to be inserted into the bore and held therein by engagement of its outer surface with an inner surface of the bore, and an annular bead extending circumferentially and inwardly from the inner surface of the sleeve, the bead being disposed to engage an outer surface of a piece inserted into the sleeve. The sleeve and the bead are integrally formed of resilient flexible plastic.

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What is claimed is: 1. A device for holding a piece in a bore, comprising: a cylindrical sleeve having substantially identical chamfered opposite ends and constructed to be inserted into the bore with either end leading and to be held therein by engagement of its outermost surface with an inner sur

What is claimed is: 1. A device for holding a piece in a bore, comprising: a cylindrical sleeve having substantially identical chamfered opposite ends and constructed to be inserted into the bore with either end leading and to be held therein by engagement of its outermost surface with an inner surface of the bore, the sleeve having a longitudinal cross-section in which a cylindrical wall thickness of the sleeve is defined by outermost and innermost substantially parallel lines and the chamfered ends are defined by lines that slope from ends of the outermost line toward the innermost line; and an annular bead inside the sleeve extending circumferentially and inwardly from a location on the inner surface of the sleeve that is substantially equi-distant from the opposite ends of the sleeve and having an exposed innermost surface to engage an outer surface of a piece inserted in the sleeve wherein the sleeve and the bead are integrally formed of resilient flexible plastic. 2. A device according to claim 1, wherein the bead has a circular or oval cross-section. 3. A device according to claim 1, wherein the bead has a rectangular cross-section. 4. A device according to claim 1, wherein the bead is connected to the inner surface of the sleeve by a web that is thinner than the bead in longitudinal cross-section of the sleeve. 5. A device according to claim 1, wherein the bead has at least one slot interrupting its circumference. 6. A device according to claim 1, wherein the bead is hinged to the inner surface of the sleeve. 7. A method of holding a piece in a bore of a body comprising: providing a piece-holding device having a cylindrical sleeve with substantially identical chamfered opposite ends and constructed to be inserted into the bore with either end leading, and to be held therein by engagement of its outermost surface with an inner surface of the bore, the sleeve having a longitudinal cross-section in which a cylindrical wall thickness of the sleeve is defined by outermost and innermost substantially parallel lines and the chamfered ends are defined by lines that slope from ends of the outermost line toward the innermost line, and having an annular bead extending circumferentially and inwardly from a location on an inner surface of the sleeve that is substantially equi-distant from the opposite ends of the sleeve and having an exposed innermost surface to engage an outer surface of a piece inserted into the sleeve, the sleeve and the bead being integrally formed of resilient flexible plastic; inserting a piece in the sleeve of the piece-holding device so that the outer surface of the piece engages the bead; and inserting the piece-holding device in the bore so that the outermost surface of the sleeve engages the inner surface of the bore. 8. A method, according to claim 7, wherein the piece is inserted in the piece-holding device and then the device and the piece are inserted in the bore. 9. A method according to claim 7, wherein the piece-holding device is inserted in the bore and then the piece is inserted in the device. 10. A method according to claim 7, wherein the bead is provided with at least one slot interrupting its circumference. 11. A method according to claim 7, wherein the bead is connected to the inner surface of the sleeve by a web that is thinner than the bead in longitudinal cross-section of the sleeve. 12. A method according to claim 7, wherein the bead is hinged to the inner surface of the sleeve. 13. An assembly including a piece to be held in a bore and a device in which the piece is inserted for holding a the piece in the bore, wherein the device comprises: a cylindrical sleeve having substantially identical chamfered opposite ends and constructed to be inserted in the bore with either end leading, and to be held therein by engagement of its outermost surface with an inner surface of the bore, the sleeve having a longitudinal cross-section in which a cylindrical wall thickness of the sleeve is defined by outermost and innermost substantially parallel lines and the chamfered ends are defined by lines that slope from ends of the outermost line toward the innermost line; and and an annular bead inside the sleeve extending circumferentially and inwardly from a location on the inner surface of the sleeve that is substantially equi-distant from the opposite ends of the sleeve and having an exposed innermost surface to engage an outer surface of a piece inserted in the sleeve, wherein the sleeve and the bead are integrally formed of resilient flexible plastic. 14. An assembly according to claim 13, wherein the piece is a bolt. 15. An assembly according to claim 13, wherein the bead is connected to the inner surface of the sleeve by a web that is thinner than the bead in longitudinal cross-section of the sleeve. 16. An assembly according to claim 13, wherein the bead is hinged to the inner surface of the sleeve. 17. In combination, a body having a bore therein, a piece-holding device inserted in the bore, and a piece inserted and held by the piece-holding device, wherein the piece-holding device comprises: a cylindrical sleeve having substantially identical chamfered opposite ends and constructed to be inserted into the bore with either end leading, and to be held therein by engagement of its outermost surface with an inner surface of the bore, the sleeve having a longitudinal cross-section in which a cylindrical wall thickness of the sleeve is defined by outermost and innermost substantially parallel lines and the chamfered ends are defined by lines that slope from ends of the outermost line toward the innermost line; and an annular bead inside the sleeve extending circumferentially and inwardly from a location on an inner surface of the sleeve that is substantially equi-distant from the opposite ends of the sleeve and having an exposed innermost surface to engage an outer surface of a piece inserted in the sleeve, wherein the sleeve and the bead are integrally formed of resilient flexible plastic. 18. A combination according to claim 17, wherein the bead has a circular or oval cross-section. 19. A combination according to claim 17, wherein the bead has a rectangular cross-section. 20. A combination according to claim 17, wherein the bead is connected to the inner surface of the sleeve by a web that is thinner than the bead in longitudinal cross-section of the sleeve. 21. A combination according to claim 17, wherein the bead has at least one slot interrupting its circumference. 22. A combination according to claim 17, wherein the bead is hinged to the inner surface of the sleeve.