NOVELTY - Ends (11) of the roller body (1) and the reception bores (21) of the end caps (2) each include grooves (12, 22). When assembled, the grooves coincide, forming bore-like hollow cavities. A coil spring or spring peg (4) is inserted into each cavity and prevents relative rotation between roller body (1) and end cap (2). Three sets of coincident grooves and three coil springs or spring pegs are included in each cap and roller end. The coil springs or pegs, center the caps on the ends of the roller body.    USE - A ceramic conveyor roller with metallic end caps, used in e.g. vacuum coating and etching of glass or solar cells.    ADVANTAGE - The new method of attachment keys the end caps to the rollers, such that they cannot undergo relative rotation. The required torque is transmitted. In addition to keying, the design precision-centers the end caps on the rollers. This assures that the cylindrical rollers run true. An interference fit is established between the springs or pegs and the grooves. High temperatures, up to 800 degrees C in some applications, are resisted. Chemical cleaning processes do not interfere with the attachment, unlike the case where adhesives are used. The end caps can be detached when necessary, by use of push-out screws. Thanks to the introduction bores, assembly is easily completed after fitting the end caps onto the roller.    DETAILED DESCRIPTION - The diameter of each spring or peg, exceeds that of the corresponding cavity. The end cap includes extensions of the grooves. These form introduction bores (23), for insertion of the springs or pegs. Each end cap also includes a push-out bore. This allows force to be exerted on the end of the roller body. For this purpose it is internally-threaded. Optionally it is concentric with the end cap. Alternatively a push-out bore is located between each pair of introduction bores. A pressure plate (5) is located between each base of a reception bore in the end cap, and the corresponding end of the roller body. This is used when pressing the roller body out of the end cap.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross section, end view and cross-sectioned, perspective end views of the cap attachment on one end of a roller.    roller body (1)    end cap (2)    coil spring or spring peg (4)    pressure plate (5)    end of roller body (11)    grooves (12, 22)    reception bore (21)    introduction bore (23)