And we are still referring to the smok tank yes?
Ok, that is the problem.
DO NOT USE THIS TANK ON A MECH!
Two things, the rubber seal will split. There is a small protruding ring machined into the top edge inside the airflow section, which is repeatedly compressed each time the coil section is changed. This rubber is very soft, for sealing reasons, yet too soft for it's purpose, and will split causing a dead short.
IF, the design has not changed from the VTC tanks, it will not take very long. Took less than one week for two different tanks I have here.
I machined new pins from stainless screws, used one of the tanks for a mold and melted hot glue for the seal. Which also keeps the pin from touching the inside wall of the threads.
EDIT: I also used a guitar pick, ground just the size of the new pin head, and pin itself, to separate or insulate the pin from grounding against the bottom of the airflow section.
I traded that tank for another tank with the same issue, so I'll be doing this again. Right now I don't trust that VTC tank so it's collecting dust.
What is so difficult in adding a PET seal on these, much like any RDA. The pin should NEVER move for ANY reason. We learned this years ago, and it's still being done. Amazing.