Quick question regarding tech specs...
"Self-adjusting center contact pin ensures maximum compatibility with tanks and atomizers."
My brass pin doesn't move, how is it "self adjusting" if the pin does not move like a spring loaded 510?
You answered your own question.
It's not spring loaded, and the tech specs don't say it is.
The orange O-ring under the center pin (same setup as the P3, New Classic, and Radius) allows for some play when an atomizer is connected.
You can't, however, push it down by hand...at least not very easily.
But when you mechanically thread your atomizers onto the cap, it will adjust.
Example:
For the old Provari v2.5 (and earlier) the center pin was fixed. My Kayfun Lites would not sit flush, unless I modified the insulator on the Kayfun.
With my P3's, I don't have to do that, because the P3's pin will flex.