Reading this thread has been very interesting. I'm a relative newbie and am using the AFSv2 on a Silver Bullet. So far ... only a few minor slight leakages .. all which have been stopped and fixed through trial and error. This I expect from what I've been reading, until I can get this thing mastered.
So my strategy has been to go slow ... real slow. Once it is set up and vaping well ... I am really reluctant to "mess" with it. Paranoid even maybe. Especially when it comes to over torquing the O-rings. My experience with O-rings over the years says that if at all possible, they will find a way to leak. And for perspective, loosing a little nic-juice is a minor problem compared to leaking radioactive coolant (I work in a nuclear power plant) into an uncontrolled area because an O-ring decides to stop playing nice.
O-rings go bad .. they just do. It can be overtorque; it can be overpressurization, it can be underpressurization (ie. vacuum), it can be a small defect; it can be due to drying out and rewetting; it can be they get minute amounts of debris gunked up on them. It can also be old age.
O-ring problems for the most part I have figured out how to avoid. As far as the different attys being manufactured, the way to punch a hole in cartos, the various control ring finesses, and some of the other nuances ... well, that's why I'm reading this thread now, as these issues are bound to eventually manifest in my experience.
We used to say in the Navy (the 7 P's): "Proper prior preparation prevents piss poor performance".
So, please keep up the good work helping everyone with their AFS learning curve guys. I'm learning a lot, and so are others.
Also, nice try ... trying to get that AFS at a discount. I wouldn't give up my AFSv2 either. That would be SILLY. It is waaaay too sweet. And, if it's working for others, it will work for me.