Abstract: A holder for rotatably retaining a roll dispenser tube in its carton includes a self-tapping screw for piercing opposite ends of the carton and engaging the inside of the tube. Each screw has a shallow head forming a thumbturn that occupies minimal space outside of the carton. In one configuration, the shank of each screw forms a sharp cone-shaped root surface having a first thread member extending from the apex to the head member, and a second thread member displaced 180: from the first and extending from the head toward the apex, but not necessarily reaching it.