Thanks! Yeah, I've been putting little ss mesh collars on the ends, for storage, management and passing through wick holes. When I'm done, like you said, I just slide off the collar and wrap it around the end of the remaining bulk cord.
edit: Your thinking, with a little thread to hold it, I imagine I could re-gather a used wick tip, build and leave the bit of thread. The ss collar works well in that I wrap it on the body of the rope, then slide it over to cover the end; but it would get in the way of RE-building one of these "J"-wicks. (Oh, that's 2 letters I've got now)
edit: OK, I see, it's like a repeated 1/2-hitch. very cool.