I recently purchased a Black Diamond 12cm dogbone, like the one on the left (the longer one is 18cm). Has anyone found a use for this in canyoneering? I was thinking it might useful -- on occasion -- to serve to extend the rappel device. Why would one want to extend the rappel device, you might add? Well, if (and that is the operative word) you are using an autobloc as some sort of self-belay, you would want to make sure the autobloc and the rappel device don't come into contact with one another. I do know that you could just chain 2-3 carabiners together as well, but I think the dogbone is a better solution, should one want some mild extension of the rappel device. It weighs next to nothing and is more than sufficiently strong. And its cheap as well (3.95 for the 12cm). Just wonderin' . . .