Well, i got the pup and it wasn't actually too loose. The thing is, when i tightened it, it slowly slipped and became loose again. So i took some black duct tape and put it over the joint. The duct tape isn't too strong, so i had to use a strip about 5 cm long. For the time being, it keeps it together but unfortunately not too tight.
Also, the tape seems to be disfigured since on the upper edge it can't get completely straight no matter how i tighten it. As for the sound, after installing it i tested it on very low volume (since it is 12 here) on a randall warhead x2 (which is ss) and what surprised me even at such volumes was the ability to clean up with the volume. It was a nice, natural od/dist with the volume low that i hadn't experienced from the x2 before (since it is usually quite harsh and 'hard' distortion due to being ss). So, the first impression is very good. I can't wait to test it through the tubes tomorrow. Also, no microphonics (that's good)
By the way, the nailbomb replaced a jb in a jackson dk2s. While the jb wasn't a bad pup, i really really hated its cleans and sometimes found the bottom lacking. Well, the nb has infinitely better cleans and from the little i heard it seems better overall. The dynamics are great.
I hope nothing happened to the pup when i asked force on the tape to keep it together. If every bkp sounds just as good, i should start saving for christmas.. :D