I make those the lazy way.
-Make the eye just like a normal splice by pulling the end back into the core.
-Then cut both the inner and outer core at the same time at the desired length.
-Burn the ends together so that it kind of forms a little stub.
-Then just put a single of figure eight knot in and you are done.

IMHO the Turk knot in the expensive version is just for show.