Thanks very much E1320 for the review! This is an interesting option for the less technically inclined who are still interested in a custom flashlight. Classic flashlight body style there, one of my favorites.
The Nanjg driver is rated from 2.8-6.0 volts so it won't work with an AA battery. I don't know of as any drivers that will push an XML hard enough with an AA battery perhaps you should consider switching to a 14500 IMR battery.
The pill is very light weight the walls are thin it's the only way you could make it to allow a 16mm star and 17mm driver to fit, but the threads are really nice.The pill gives great heat transfer because of the nice threads. Here some more pictures.
I just repaired an AKOray that I bought from DX months ago, the driver died when I tried a 14500 battery. I used a DX #25505 16.7mm driver that I sanded down to fit.
I see from the picture your pill doesn't have the included brass ring installed. How did you wire the negative pole?
That would have saved me some time, but more importantly I could have used a full sized driver, like maybe one of yours 8-)