First, I tried a thrown ring on top. I tatted the first chain, added the lower ring and attached it, then did a thrown ring with the chain thread. If I had tightened this, it may have aligned a bit better, but I still have a bit of gap in the middle. I could probably live with that, but can I get it better?
Next I tried looping again, but this time I passed the chain thread through the loop along with the core thread. Now it is looking a lot better.
The first photo shows that I inserted a hook left of the rings and pulled up a loop, easier seen in the second photo. I passed both threads through this loop then pulled it up tight. The last photo is to show that when I do this, the upper ring flips over so the thread comes under the chain correctly.
Does this mean that this is gospel? NO! This is just my findings and what I think I will like. Any way you can do it is quite valid as long as it works for you. I just hope this helps someone trying to do this.