It features a chrome-plated steel cam with bitey teeth with a nylon catch and a rubber over-molded plastic grip. It will take anywhere from an single 8mm rope all the way up to a 13mm, and the design of the cam includes a vent to self-clean muddy or icy ropes. For those who have never seen or used one of these, the idea is simple. with the rope fed into the bitey-cam's jaw, the sping-loaded cam is pressed against the rope, but due to the angles used, doesn't bite down when the rope is pull (or pushed) from top to bottom. It bites down when weight is applied bottom to top.
What this means is that when you are going "up" the rope, it moves freely, but doesn't move backwards. A safe method for ascension! Better still, the clever folks at Petzl have included a variety of attachment methods, to make this a very versatile tool. A small hole in the base facilitates a lanyard or foot-sling, (which -massively- improves the efficiency of my ascents, I've found). The main hole at the bottom connects to your harness in regular ascents, but between this, and the double set at the top, this piece can act as part of a self-belaying system or a hauling system, in conjunction with other similar tools.
This is not the kind of tool everyone will need or want, and does take some adjustment to not only use efficiently and safely but I've found that for hauling gear, or scooting myself up a fixed line, I couldn't ask for a cooler piece of kit. Its mountain-rugged, and hardy enough to take a 4-6kN fall, depending on the thickness of the rope you are using, and be sure to follow the Safety guide instructions as it has some limitations, especially with regards proper attachment and positioning. A very good piece of kit to have for multipurpose climbing utility!
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