A photoconductor for electrophotography including a conductive substrate, an undercoat layer provided on the conductive substrate, and a photosensitive layer provided on the undercoat layer and a manufacturing method thereof. In an exemplary method, the device receives multiple message threads, where each message thread includes one or more messages that are related to each message in that thread. A quick release is provided which will disconnect the tow rope should the skier activate it or fall.