Question....
I just picked up my first 2.5. Using a Subtank Mini and Nautilus Mini. How do I get rid of that 1/2mm gap between the tank and 2.5?
This gap is releasing my generally complacent OCD.
Get yourself a circle cutter, and a hole punch ( the kind for making the holes for three ring binders). I use scrap tagboard, plastic coated paper, thin plastic, and back sheets from notepads to make a variety of these spacer rings for my 2.5's, and for my P3 devices with 510 atomizers.
Any atomizer with a long centerpin, and especially ones that utilize a silicon insulator, like the Protank 2 coils, gets a spacer to take up the excess gap, and also allows me to snug the atomizer down without deforming the insulator. You want to see where the atomizer winds up making contact, and selecting the proper spacer to allow contact, and a little snug, like 1/4 to 1/3 turn.
These spacers are also quite good for getting the airhole where you want it if using a Genesis type atomizer.