Here, I follow the thread from Reply#42-#43. The knot presented there as a midline bend, can also serve as a adjustable end-of-line loop. The same can be said for two variations of it that are presented here.
If we want to keep the bights of the collars tightly wrapped around the penetrating ends of the main line, we must somehow entangle the ends of the attached line, at their path through the coil tube. Doing this, the bights are nipping the main line hard, they can not move apart from each other, and the main line s helical structure remains intact, however tensioned it might be.
Of course, to entangle the ends of the attached line, we have to manipulate them carefully inside the coil tube of the main line, and this makes the tying of the mid line bends, or the loops, that are presented here more "difficult", than when the ends were just parallel to each other, as they were at Reply#42. However, if, while we are tying those mid line bends or loops, we keep the - most simple - knots tied with the attached line in our memory as simple mental pictures, we will not make any mistake.
I have to mention one more characteristic of those knots, that might have escaped the attention of the future reader. The helical coils, the coil tube, is winded around a core of three rope diameters, which is good because the core remains stable ( each rope line is adjacent to the other two) and the diameter is sufficiently large. We wish the curves of the main line of the mid line bend ( or the standing part of the loop ) to be as wide as possible, because this line bears the heavier loads, and it is this segment of the knot that should be watched more carefully, if we wish to somehow improve its strength.
See the attached pictures for two variations of the 2 coils-2 collars midline bend, or end-of-line loop, with a more tightly entangled core. At the first, the helical coil of the main line travels around a fig. 9 stopper knot, and at the second around a double overhand stopper knot. I also post pictures of the internal cores, tied with the attached line, at the same scale, so the future reader would not need to see through the ropes with his X rays vision...