Great to hear this is working nicely MisterD. 2.5ml is a nice capacity, using a charger adapter for this and getting 1ml doesn't seem to compete with using a cartomizer.
Besides the $100+ for the gg afs, it seems that by design as juice seeps into the atty to keep atty fed, it would a) be hard to regulate for viscocity, and b) reach equilibrium between tank and atty and thus flood over time. Plus, laser drilling attys???
Having thought a bit more about this, with the fob, you have 3 sources of threads to adjust, counting the fob itself. I had thought of backing off the fob from the battery to let air in, but if you forgot, the juice would leak all over the battery-- not so nice, so that should probably be kept sealed.
The fob can be opened to fill, and could be left slightly backed off to let air into the system allowing each draw to feed the atty. Otherwise when filling, the spring/ tube assembly seems fiddly to get back together. Once built it would be better to keep closed and fill another way. Also, letting air in through the fobs threads and backing off the atty itself leaves the fob's lid quite loose.
I hope the JB weld cures overnight to make this more pleasurable for you, and please do tell, where is the air getting in?