Lol. The pin is one of the best sealed pins I've seen - as discussed way back it is 'spongy' rather than rigid but definitely not spring load in the true Kangers. On the Gearbest site - in the Q&A someone asks 'is this the new one with the spring loaded 510' and the answer is yes. Kanger, as I've understood from a few sources considered it but had some problems with the kbox regular mod. One comment (quick search) gives what problems they had with it:
"Be very careful to not over tighten the 510. The rubber O-Ring will break and the spring loaded pin will push its O-Ring back into the box."
So with the Kbox mini they went with a good sealed pin fixed. There was some discussion on the Kangertech facebook page from the poster 'Kanger techguy' or something indicating that he works there.
Thanks, Kent.
And Kat (since I see you haven't left quite yet), please take notice.