I think a problem might be that some people are screwing their RDA's down too far causing damage to the 510 and causing the seal to break. It's not a spring loaded 510. Most of my RDA's when screwing them on will hit the bottom of the 510 before sitting flush with the mod. I use a thin washer between the mod and atty as to not allow the RDA to force and damage the 510. I think forcing it all the way down will cause possible leaking.
Interesting. I too noticed when I first got the Aurora, that several RDAs I own, bottom out on screwing it down, well before they sit flush. In my case, the Recurve is one of those, it seems to have a slightly longer 510 pin than many others I have.
I've used the Nudge on mine for the most part, no leaking yet. The Nudge doesn't have a very long 510 though compared to the Recurve.
I'll bet you are right though, screwing an atty down until it is flush might be causing the leaking. Depending on the 510 pin length of course.
Kind of a shame that one needs to use a spacer to avoid this issue. That is, if that's what really is causing the leaking for folks. It seems like the usable 510 depth on the Aurora is pretty shallow then. I noticed when I first got it, that you really had to crank down an RDA, sometimes a good number of turns. If this is the case, I will have to buy some spacers somewhere. Anything I try to cut to use as a spacer is going to look like crap, lol.