Does this look right? (arbor knot) It self tightens when I stick my hand through it but I can also untighten it if I move my hand the other way. Is that normal?
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Do you mean pulling on the free end of the rope? If there is nothing inside the ligature, it will come undone.
With your neck inside and under the weight of your entire body, it will close to the maximum and it will be impossible for it to loosen.
I think I'm done with my setup. Did an arbor knot for the noose and a round turn and two half hitches (with an extra clove; I would've done extra turns but I forgot and didn't want to redo the whole thing). Ended up going with vaseline instead of dish soap bc it felt less gross. The only thing I'm concerned about is the fact that sticking a water bottle through the noose to test it just ended up constricting the noose greatly and with my feet staying on the floor, but I think it should work anyways. I'm just gonna get all my letters in order and then hopefully I'll ctb :)
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The setup looks good. When you plan to attempt, remember to put the ligature in its correct position on the neck, as close to the skin as possible. The knot of the ligature should be behind the neck in the center.
Tighten the anchor point knots firmly, and if you wish you can add a stopper knot (over hand knot) to the free end.
I hope everything turns out as you wish.
Remember that you can change your mind at any time. Information is just information and can be used when appropriate.