A horizontal lifeline shuttle apparatus is provided. The horizontal lifeline shuttle apparatus includes an attachment portion, a body portion, and a cable channel. The body portion is configured to at least partially surround a portion of a cable so as to retain the portion of the cable within a cable channel The attachment portion is configured to move relative to the body portion based at least in part on the motion of the moveable pin fixedly secured thereto. At least a portion of the moveable pin is disposed within each of a plurality of moveable pin guide grooves positioned within the body portion such that a range of motion of the moveable pin is defined at least in part by the plurality of moveable pin grooves. At least one of the plurality of moveable pin grooves comprises a vertical portion.
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