That is just a little curl at the top, kind of ended up looking like it was folded.Nice job on the mesh straws, TD! I like the way you folded the edges to get a smooth rim.
About the posts, if they are similar to the GT2-S Hotcig clone, you can unscrew both posts and then the 510 screw like this guy does:
Thanks for the video, I'll have to see if this one does the same thing when I take the 30g build out.
It is a great little rta, mine was weeping out the bottom air holes when I went up stairs to visit a friend just now. Definitely a wick issue, I put some dm Ball Viskose (Rayon) in there and probably should have stuck with Japanese cotton.
Some new devices have a really big wow factor. Like when I picked up the FeV V3, this one not as much. I am going to try cutting a cotton pad from Japanese cotton and see how that works but I think that is for the dripper mode.