NOVELTY - The end cap comprises a shaft end for rotatable support and/or a receptacle for a roller body. The receptacle is formed by two receiving segments (21), which are rotatably stacked relative to the shaft end around a rotational axis running transverse to its longitudinal axis so that the receptacle for the end of the roller body is spaced apart from a distance between the receiving segments. The receiving segments comprise a conic contact surface, which stands in an operative connection with an adjustable position element.    USE - The end cap such as a turned part is useful for a carrier roller having a ceramic roller body, where the carrier roller is useful for performing coating and/or etching process on flat substrates of solar cells.    ADVANTAGE - The end cap can be simply and economically manufactured.    DETAILED DESCRIPTION - The end cap comprises a shaft end for rotatable support and/or a receptacle for a roller body. The receptacle is formed by two receiving segments (21), which are rotatably stacked relative to the shaft end around a rotational axis running transverse to its longitudinal axis so that the receptacle for the end of the roller body is spaced apart from a distance between the receiving segments. The receiving segments comprise a conic contact surface, which stands in an operative connection with an adjustable position element so that the adjustment of the position element causes a relative rotation of the receiving segments around its respective rotational axis, and an extension set (24) projecting over its rotational axis. The receiving segments are connected to a connecting plate (23), which is connected to the shaft end. The extension set comprises the conic contact surface at its inner side. The shaft end comprises an external thread in a region of the conic contact surfaces of the receiving segments, and the position element is arranged on the external thread. The position element is formed as a cone ring with an internal thread, and comprises an adjusting nut. An INDEPENDENT CLAIM is included for a carrier roller.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic sectional view of an end cap for a carrier roller.    Receiving segments (21)    Knobs (22)    Connecting plate (23)    Extension set (24)    Through-hole. (25)