A manually-operated sweeper, having a wheeled chassis with steering handlebar and a dirt collection container. The invention further relates to a record carrier for use in such a method and recording device. Embodiments of the methods reduce the manufacturing step of quenching and tempering ends of a steel tube to compensate for wall thinning during threading operations. Temperature sensors are attached to the immovable portion and the movable portion for detecting temperature of the heat pipe. For example, opposed valve leaflets may be temporarily grasped and held into position prior to permanent attachment.