If the negative post on your Manta or Manta v2 RDA is loose or wobbly, or if you use it on a DNA40 mod, always with the same coils, and you've detected the resistance is slowly crawl up by (0.01 ohm by 0.01 ohm), here's what's happening: Sadly, on this RDA, the negative post is a separate piece that's command onto the bottom with a pin. You'd expect a device of this price to possess a polished negative post, but... there you go. The pin is deformed to hold the post in situ and forestall it from turning after you tighten the screw. Unfortunately, the Manta has a history of coming from the manufacturer with a loose pin, or developing a loose pin over time. To fix it, do the following: 1/ Separate the bell from the base, and remove the screws from each posts 2/ Drill a 7 millimetre hole into a little flat little bit of plyboard and slip the base's 510 connexion into the opening. This is so you'll apply force equally to the whole surface at rock bottom of the b...