It's not surprising to hear a manufacturer asking its users not to modify their climbing hardware, but it is interesting to hear why. Black Diamond have written an interesting article about the various modifications that they are often asked about; re-slinging cams with extender slings, using a screamer between you and your ice axes to hold a fall, swapping the bails on your crampons. They carried out tests on each of these - and generally the result is not ideal; with failures at relatively low loads.
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