Glad you like the hitch! The ring under the twist works good, and it can be turned vertically for another slight variation.
Below are the two main ways I use the hitch, if sewn or spliced eyes are used, a metal ring, or tube for the twist works as well as the rigging rings. Any type of metal can be used, around a one inch inside diameter will allow most 8mm eyes. A lot cheaper than the rigging rings, and works just as well.
Unless you are going to a larger diameter cord in the 10mm range, a bigger ring for the front might not be advisable, if the sections of cord going through the ring are spread too far apart, slack that developers in the hitch will move up to the wraps creating friction and will eventually bind up.
Since there isn’t much hardware to soak up heat from friction, a heat resistant type hitch cord is best, the 10mm HTP you mentioned wouldn’t be suitable, too stiff and only polyester, that is the climb line used in a lot of the pictures.
The bottom hitch shows how to get as close as possible to the hitch and is cheaper than a sewn cord, a five foot piece for 8mm cords. The stopper knot is only an overhand for the picture, use a stopper that you feel is secure. I’m finding that both versions work about the same.
