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More on Rescue and Gear Shenanigans 4-Dec-2010 At 7:51:40 AM hargs

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>What's the lighest mini traxion type device (pulley/cam) availble?

Kong's Futura Mini block is 162g.

If you don't need a pulley, then a tiblock with the rope bent around the biner will work. If you do need a pulley, hang a proper pulley -- one in a casing with eyes for hanging -- inside an oval biner (i.e., off the top of the biner) and attach the tibloc (to the bottom of the biner.) Suspend the whole thing from a locker clipped to the pulley biner (i.e., between the pulley's sideplates).

Replace the Basic ascender in that last diagram with a tibloc. Most (thin) lightweight pulleys will work. A Petzl Fixe doesn't fit inside many oval biners; it fits in a Petzl OK -- but only just, it's not ideal -- but it doesn't go anywhere near my BD ovals.