Yeah, I couldn't see exactly what you were doing by the picsAll thread. Just unthread one end...
Rivet nuts are basically what I used...
I guess I didn't make it clear that I used aluminum tube that goes through the tank. Each end is spread and flared with JB weld to seal it. If you flared it perfectly you probably wouldn't even need JB weld...
I'll go back and put an edit in the post.
I see there's a method to your madness