Here are the pics of the differences between the two Term V2's I have and a couple of the what I think just might be baked on spent juice on that nut. Pics of the two type will have the new one on the left the old one on the right.
The side with the o-ring
The side facing the cup
Different knurling on the nuts, also the ring that holds the neg wire is the same way.
In these pics you can see that the old one is flat on both sides, the new one is counter sunk on one side. I believe this helps hole the o-ring in place and better centers the positive post.
The other sides, both are flat. This is better for trapping the wire.
The airflow hole is smaller on the new one, this makes for a very slight tighter draw but seems to make more vapor for some reason.
The threading for the nut that traps the wire has more threading making it easier to use.
In case you are wondering the ceramic cups are the same, in fact they look like they could have come from the same mold.
After looking at the pics I think the coloring is from spent juice working its way down from the cup a baking on to the nut. If you look at the pic that shows the threading of the center post, the left one, you can see some of the coloring on the threads that go in to the cup. I guess maybe I should break it down a clean it more often.
