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Petzl Micro Traxion Pulley
Setting up a self-belay system on two ropes with two ascenders - Petzl Other
Alpine Savvy - Rope ascending with a Petzl Tibloc and Micro Traxion . See 350+ more tips like this at alpinesavvy.com . Modern hardware such as Tiblocs, Grigris, and plaquette style belay