It's official! 
My batteries are still in the mail. As was predicted, I do have a couple questions.
Where is this o-ring supposed to go? It came with the atomizer.
The o-ring will not stay on the bottom of the atomizer (notice the gap/indentation). It seems this indentation is there for a reason, not sure what though.
Gap on this one too? Is this normal? Is there something that needs adjusted?
Last question, for now! This piece of string was in the plastic bag with the atomizer, what is it for? Free gift?? LOL

My batteries are still in the mail. As was predicted, I do have a couple questions.
Where is this o-ring supposed to go? It came with the atomizer.
The o-ring will not stay on the bottom of the atomizer (notice the gap/indentation). It seems this indentation is there for a reason, not sure what though.
Gap on this one too? Is this normal? Is there something that needs adjusted?
Last question, for now! This piece of string was in the plastic bag with the atomizer, what is it for? Free gift?? LOL