I have another midline loop here, may be ok, have not a test on it yet.
This is a very good knot Alan, i don't think i have seen it before.
I'm refering to your first image of your previous reply#59, where the knot is shown in loose, front and back view.
I see it as a retucked version of Abok #1054 farmer's loop. One has to remove the "around the eye legs" collar to find the correspondance.
No overhand is embedded into the structure, due to the retucking function, which appears to improve the knot stability (compared to farmer's). It surely worths investigating the jamming profile.
