Well, I've been out for a couple of days and I've just read all the missing messages on this thread......wow!
Twenty pages ago it seemed that the ranting about the 510 connection was on rampage, and I haven't found anything about a little detail that I think everybody is missing. I'll try to explain myself, but I'm afraid that my English would not keep up with the task.....
First, the threads. Plenty has been said about them. It's obvious they are not machined on a hard metal, so some protection is strongly advised. Better to wear the adaptor (any adaptor, it's your call about how it appears...) than the in-site machined threads.....
Having said that, there is the question about the insulator, the sinking of the central pin, at all that jazz....
I've been using my iStick since September 29th, on a daily basis. It is my out and about mod. Always with the Smok 510-510 AFC adaptor (those threads). I've put every conceivable atomizer on it. I do not have plenty of them, but I'm fortunate enough to have drippers, genisis, a Fogger, and several 510 and eGo Kanger clearomizers.
And yesterday my iStick started to complain about 'atomizer short' if I screwed it too snug....
So I dismantled the adaptor and pry up the central pin. Just like the old fashionable eGo's. Just like my now unused L-Rider miniLambo. It's not so hard, easy with care, and it's been a normal procedure for those type of 510's, which are insulated with just a plain rubber grommet.
After that I compared the lengths of all my male 510's, and I discovered something troublesome: all my Fasttech drippers are really long, then come several Fasttech 510-eGo adaptors. My Fogger, UD AGA-TD and Aerotank are more or less of the same length. Finally, the eLeaf supplied 510-eGo adaptor (the one with the knurled ring) is the shortest of all!
Interesting! The 510 female on the iStick is prone to get sunk, and their adaptor has the shortest male 510.....
And of course, as I'm vaping on a Trident (long 510) and on Kanger clearomizers on my iStick, sooner or later its 510 will get sunk. Well, sooner, just yesterday!
Even using the Smok AFC adaptor, as its central pole floats a bit over the delrin insulator, it passes the pressure of any long-510 atomizer to the iStick's central pole.....
So I'm now running my iStick with the supplied 510-eGo adaptor, both to protect the threads and to make longer the 'prying up' intervention on it.
Check your frequently used atomizers and adaptors on your iSticks! It's easy just to put them, two of them each time, confronted by their 510 males, to check which one is the shorter... and about adaptors, maybe it's high time to pick up the shortest one!
The supplied 510-eGo adaptor seems to be partially regulated, if you turn counter-clockwise its central pin while you fix the other end. If not, both turn over the delrin insulator. But once you get accustomed to this trick, it seems to become not so deep, which is its major drawback. Some ego clearos, like my new EMOW, wouldn't connect without this final adjustment.
About the short-cuts, be warned that the 510 connection on the iStick is built over a plinth (I think that's the word) machined directly on the top plate, and all the top plated is connected to ground (negative), so if the central pin goes down, it will touch the grounded metal and shot-cut. This is different to all the former '510-sunken' mods (from eGo batteries to several others), in which the sunken pin didn't short-circuit anything, as the grounded metal remained surrounding all (the mod body).
I think eLeaf designers did it in that way to ensure better insulation against e-liquid leakages..... I'm trying to remain optimistic....
Hope this long message would help to understand what it is happening and how to avoid it, or at least, minimize the interventions....