Wow, yes that is the V2, that chuck is not supposed to come apart like that -- maybe for occasional internal maintenance, but not for regular use. In the middle picture you have metal sticking out of the hose part on the right, the threads obviously go into the other metal part on the left, but the metal part on the right there is supposed to unscrew out of the black rather than the knurled surround unscrewing off its mate, so you don't have to mess with those internals. Does that remaining metal part screw out of the black for you, or is it stuck in there? Maybe some loctite to hold the chuck together, and some grease on the black threads, so that the threads on either end of the chuck are more likely to move than the threads in the middle?