Abstract: The invention is based on the objective of disclosing a method for sealing containers, particularly bottles, in a mechanized fashion by means of rigid closures, particularly rigid glass stoppers that require careful handling. To this end, an assembly (110) is provided that is designed for sealing containers (20), particularly bottles, by means of rigid closures (10) that are adapted to the containers (20), particularly glass stoppers. The assembly comprises a controllable ram (180, 190) for joining the at least one container (20) and the at least one rigid closure (10), as well as a holding device (300) for holding the at least one rigid closure (10), wherein the holding device (300) has a shape that is at least partially adapted to the shape of the least one rigid closure (10) in order to hold the rigid closure (10) in a predetermined position.