The insertion module inserts bearing hubs into a workpiece (bearing roller). The workpieces are advanced to a precisely defined position by the transfer line with the help of a baffle plate and an advancing stopper cylinder. A through-beam sensor detects the workpiece. The transfer line is stopped. The bearing hub can now be removed from the gravity-feed magazine. A handling device (linear gantry) with gripper grasps the bearing hubs and inserts them into the waiting roller. When the insertion process has been completed and the linear gantry has returned to its initial position, the transfer line is started, the stopper cylinder is retracted and the workpiece moves on.