Why are hitches much more "dependable" when I have never had the grigri fail?
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If you were referring to what I said. First, I didn't say "much more" dependable just dependable and then added imo. (I have actually never climbed on one of these rope gizmos except for my ascenders [which make me cringe at what I imagine they are doing to my rope]) And secondly I was intending to get you some confidence to try a hitch. I think a hitch is a better way to start out in a tree then graduate to mechanical devices after mastering the hitch. This is just my 2 cents fish. You said something about not trusting a hitch and I get that coming from a rock climber I would like to change that thinking for you. Rope on rope in a tree is a method one must try. And I mean climb with a hitch till you are making it work smoothly and without slipping. It's not that hard to dial in a good climbing hitch. Try it you'll like it.