Abstract: In a machine and method for producing plastic bottles by periodically applying a bonding agent to a cup of a series of cups adapted for successive bonding operations of each cup to respective round-bottomed hollow bodies of plastic material, and including an applicator station for applying the bonding agent to a surface of a cup, a conveyor movable in a transport direction for receiving and moving the cups, an arresting device for temporarily arresting the cup movement near the applicator station, a rotatable transporter provided with seats for the cups and with holders for the bottles above the seats, and an extraction device for removing successive bottles from the transporter, the combination of, or retrofit kit, including a drive arranged to be intermittently coupled to the arrested cup for imparting a rotating movement to the cup, and a coupler for coupling and uncoupling the drive to the arrested cup, wherein the applicator station is arranged to apply the bonding agent to the surface of the rotating cu