Thanks Jackson for the Youtube link. The variant with the leather cover and the nylon cord doesn't appeal to me, but it was a good indication of what to look for. I clicked a little further and found this video.
https://www.youtube.com/watch?v=BnWD58gWY10
I think that's going to be the way I'll work. Completely without knots, and if you do it right you won't even see the beginning and end of the line! Now all I have to do is see which line I'm using and where I can get it during Corona times. Except for groceries, all shops are closed. I have to see, I don't want plastic cord like nylon or something. I would like one made of natural fibers. A product that already existed in 1930 ...