An adjustable length knot for 2 lines and a carabiner for easy suspension
I have made myself a pair of wrecking balls from a cricket ball and 6mm accessory cord for pinch grip pullups and I am currently debating what is the best way to create a knot to hang them. Currently one of them looks as follows:
The objective is to be able to tie these anywhere that has a bar element, from gym, to tree, to home suspension beam or a simple hook.
My original idea was to simply tie the remaining cord to the carabiner and attach that to the nylon straps of my rings. However it would be much sweeter to use a knot that can self hook (i.e. attach onto itself) with some adjustability (terrain is never perfect).
My idea would be to throw the carabiner over and hook it back onto the cords which could use a ladder knot. I put this query to the more experienced climbers / rope savvied folk to see if there is a better option than my idea.
If this is of relevance, the remaining cord available is 1.5m at least on both ends.
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Unless I'm missing something you could just throw the rope over the bar and tie the two ends together with figure eight bend/sheet bend/reef knot.
If you're worried about it moving too much you could give it a couple of turns round the bar or even tie directly to the bar with two clove hitches (as Felix suggested) or round turns & two half hitches which IMHO are easier to tie to a closed bar.
If you want more adjustability you can make a simple ratchet system. Tie two figure of eight loops, one near the end of the rope leaving at least one with a fairly long end after the loop. Loop your long end over the bar then through the loop on the other rope. Back through the first loop and finish with a couple of half hitches. The second loop isn't strictly necessary but helps tidy away your excess rope.
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The clove hitch is probably what you're looking for. You can even tie it directly on the branch/beam/bar without worrying about adding a carabiner. You could also tie it to the carabiner, adjust the length, and clip the carabiner to something else.
The clove hitch is one of the most under-utilized climbing knots out there. It's infinitely adjustable because you're directly using the rope/cord, and you can tie it on any number of things.
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You could probably tie a sheetbend using the carabiner as one of the "lines". It's easily adjustable and can be doubled for more holding strength.
Back when I started climbing in the '70's we used to use a double carabiner brake to rappel (abseil) back down the face. We didn't have descending 8's or any other specialized gear for rappeling, and they still taught the dolfersitz method.
If you wanted to, it was quite easy to lock off the line so you could stop mid-rappel to enjoy the view or take a break. To do so, you'd simply pull the standing end of the rope (the part dangling behind your brake hand) up over the top of and pop behind the working end (the part above any of your hardware except the anchor) where it entered the brake. I think you could use this method to lock off your monkey's fist.
I don't have access to a camera to show what it looks like and haven't been able to find one on the 'net. You would need a regular sized carabiner to do this probably, I think the one shown in your photograph would be too small.
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