Pull a disabled climber over a long distance with 3/1 leverage. Unlike the block and tackle that requires a really long rope only a short working loop is needed so that a load can be pulled almost as far as the length of the rope. All you need is a 3oz plastic part to create an endless come along. Also required is a climbing rope and two prussics (rope loops). One prussic needs to be attahed to a secure anchor to work as primary lifeline. (RopeTie is not rated for primary lifeline and requires a safe backup).
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