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jamesf said..^^ Is that what happened to your harness hook?
Ha, I figured I'd get a comment like that soon after I posted my suggestion. Kind of saw that one coming.
No, the hook broke while out sailing, it was a very old hook but it was stainless, so I was very surprised, haven't broken another one since.
I can't imagine how this technique would hurt anyone's back, it's not like the hook is in the middle of your chest when you lean back and pushing with your leg to get the down haul that you need. Your leg does most of the work, while your arms are doing almost nothing but making sure the rope doesn't slip.