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I think most people wrap the hugger around the tree, secured with a biner or dutch clip, then a marlin spike hitch for the whoopie to sit on its knot. Check this out at about 3:20. Actually, just...

I am far from an expert about dynamic weight, etc, but I hung my hennessy from whoopie slings I got at whoopieslings.com. They worked great. Sorry to hear about your fall. Hope someone with more...