I've been using Kanger Subtank Ni200 heads for about three weeks with no issues at all. However, I finally worked up enough motivation to futz with the rebuildable deck and got an unhappy surprise. The pin part on the rebuildable deck that connects with the 510 pin in the base of the Subtank is way shorter (2.5mm) than the comparable part of the Ni200 heads.
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When I screw the rebuildable deck onto the base of the Subtank and open the airflow all the way to provide visibility inside the base of the tank I can see a pretty good-sized gap between the deck pin and 510 connection of the base. Unfortunately, it's too dark to photograph to show the gap.
It is possible to unscrew the pin on the deck a bit to lengthen amount the pin protrudes but it makes the connection to the deck way, way too wobbly to be usable. vapor beast was already very aware of the issue when I called so this would not appear to be a one-off oopsie on Kanger's part.
While what I have experienced is a rebuildable deck issue it has made me wonder if it is possible that some of the pins on some of the prebuilt Kanger Subtank Ni200 heads aren't long enough to be making rock solid 510 connections? That would explain the flaky behavior some people have been seeing.
From the picture, it looks like there is no insulator. That insulator should extend it another couple millimeters or so. Bummer!