An apparatus comprising: a drum sleeve adapted to fit over a generally cylindrically-shaped base body rotatable around an axis of rotation, the drum sleeve having a generally cylindrically-shaped inner surface defining a hollow region, a cylindrically-shaped outer surface, a first end, and a second end, the drum sleeve being securable on the base body such that the combination of the base body and drum sleeve is rotatable around the axis of rotation, the drum sleeve further including one or more mechanisms around the outer surface of the drum sleeve arranged to secure a flexible sheet of material wrapped around the outer surface of the drum sleeve, the drum sleeve configured such that after the drum sleeve is secured on the base body and the sheet is secured on the outer surface of the drum sleeve, the drum sleeve, base body, and sheet combination is rotatable and the sheet can be 1) exposed by an exposing mechanism in the case that the base body is part of a drum imager that includes the exposing mechanism and the sheet is a sensitized sheet for exposing, or 2) scanned by a scanning mechanism in the case that the base body is part of a drum scanner that includes the scanning mechanism and the sheet is a sheet for scanning characterized in that the drum sleeve is constructed using an outer cylindrical tube whose outer surface determines the outer surface of the drum sleeve, and that the drum sleeve is further constructed using an inner cylindrical tube, whose inner surface determines the generally cylindrically-shaped inner surface of the drum sleeve and the inner surface is made of an expandable material, such that the drum sleeve can be mounted onto the base body or unmounted from the base body when air pressure is applied from the base body, and, once mounted on the base body, secured onto the base body by removal of the air pressure. a drum sleeve adapted to fit over a generally cylindrically-shaped base body rotatable around an axis of rotation, the drum sleeve having a generally cylindrically-shaped inner surface defining a hollow region, a cylindrically-shaped outer surface, a first end, and a second end, the drum sleeve being securable on the base body such that the combination of the base body and drum sleeve is rotatable around the axis of rotation, the drum sleeve further including one or more mechanisms around the outer surface of the drum sleeve arranged to secure a flexible sheet of material wrapped around the outer surface of the drum sleeve, the drum sleeve configured such that after the drum sleeve is secured on the base body and the sheet is secured on the outer surface of the drum sleeve, the drum sleeve, base body, and sheet combination is rotatable and the sheet can be 1) exposed by an exposing mechanism in the case that the base body is part of a drum imager that includes the exposing mechanism and the sheet is a sensitized sheet for exposing, or 2) scanned by a scanning mechanism in the case that the base body is part of a drum scanner that includes the scanning mechanism and the sheet is a sheet for scanning characterized in that the drum sleeve is constructed using an outer cylindrical tube whose outer surface determines the outer surface of the drum sleeve, and that the drum sleeve is further constructed using an inner cylindrical tube, whose inner surface determines the generally cylindrically-shaped inner surface of the drum sleeve and the inner surface is made of an expandable material, such that the drum sleeve can be mounted onto the base body or unmounted from the base body when air pressure is applied from the base body, and, once mounted on the base body, secured onto the base body by removal of the air pressure.