So I drilled out the center pin (more like completed the wire hole already there)...I then dug
through my crap box and found one of those needles used to pump up footballs/soccer balls...I got lucky and it "just" slid in so I soldered it up and trimmed it for length...
I put it all together, screwed on an
rda, attached a bottle/tube and did a test squonk...and it leaked all over the place. But, the culprit seems to be the o ring, I changed it out with a larger silicon washer I had from my RSST days and it works great.
I think the issue may be if you have an
rda with a shortish 510 that doesn't force the center pin down far enough, the stock o ring doesn't make the seal between the pin and the brass base the pin slides through (I don't know how else to describe it, if you have one you'll know what I'm saying)