A method for narrating a digital book includes retrievably storing first data relating to narration of the digital book by a first end-user. Further, the hinge assembly is adjustable such that the hinge arm can be adjusted in three dimensions relative to the mounting plate. Such retrofitted electrically heated composite umbilicals provide an alternative for previously installed, but failed, permanent heating systems. When the heat of a fire melts the links, each torsion spring acts in a longitudinal plane of the passage to assist the intumescent material to collapse the conduit and seal the passage against advancement of the fire.