Further testing... I'm able to repeat what I did yesterday. Now I get convulsions/movements as well. Feels really weird. It seems I need to apply more pressure towards sides of neck, rather than front. I believe it's on thyroid gland where I'm placing the rope? Doesn't work pulling with the slip knotted noose. I think it requires more pressure, as in I need to attach the rope somewhere and use my body weight. What works is when I use my hands and the rope without any knot, so that most pressure is placed more towards the sides of the neck, or rather what's between front and sides of neck.
Problems I'm having is that it feels scary / SI inducing. Also the sweet spot seems to be so narrow. Maybe it's different when using weight of the body. Sliding off the sweet spot may or may not be a problem. Also it may be that when I set it up correctly and test it, I may accidentally succeed if I loose strength of my legs. It's not guaranteed that the process can be cancelled.
Still considering SN and N, not in a hurry. It's just that my mail is being checked where I currently live.
EDIT: Yeah! It works almost every time now. The rope is only 4-5mm thick. So I tried two ropes adding up to 8-10mm. Just under the peak of adam's apple.
EDIT2: Tried again, kept it longer. I can see why people get off of this... It seems the pressure I'm using cuts only part of the blood flow(?).
EDIT3: Now I get whole body convulsions, even my face makes a funny expression. I breath in a different way as well, it's like gasping for air but not quite. For a moment I was in the brink of losing consciousness, then I automatically let go of the rope. I was about to fall down whilst standing. I could describe the feeling euphoric, but quite mild such. Probably going to fall and hit my head if I continue this, that's one way to go...
EDIT4: Now I started headbanging like in a heavy metal concert. I'm hoping that the movements won't last long if I try this properly. They may cause problems.