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I use a Petzl shunt: http://www.petzl.com/en/outdoor/multi-purpose-ascenders/shunt As noted by others, self-belay is always going to carry risks - the shunt has a smooth camming surface so is rop...
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I use a Petzl shunt: http://www.petzl.com/en/outdoor/multi-purpose-ascenders/shunt As noted by others, self-belay is always going to carry risks - the shunt has a smooth camming surface so is rop...