If you pull the cap off a 510 atty, there is a little silicone cup with a hole in the middle that catches condensate. It looks like it should be aligned straight to "plug" the cart. But in every cart I've opened so far, it's been installed at an angle. I don't know if it's supposed to be at an angle, or if these carts were just sloppily assembled. The carts seem much harder to draw through with the catchers installed straight, but perhaps they're doing a better job of catching the condensate that way? Which is correct?
This
Or this?
This
Or this?