A rotating drum for use in manufacturing vapor-generating articles may include a drum body. A plurality of grooves may be disposed in an outer face of the drum body. A seat may be tractably-mounted in each one of the plurality of grooves. The seat may include a seat groove that is structured and arranged to receive and hold a rigid casing of a vapor-generating article. The seat may be composed of a material that is softer than a material of the rigid casing.