expansion chamber instilation help

i got a gta inline expansion chamber kit, and my vertical feed adapter dosn't want to screw into my powertube/ valve all the way (i need one thread showing, instead i've got many). The adapter came coated in black paint, its not like anyone is going to see the piece of brass as its inside the gun but hey, looks are looks, the bad part about the paint is that they got all of the gun, including the threads that screw into the valve- i've gotten 96% of the paint off the threads via screwing and unscrewing the valve adapter into the tank adapter, and brushing out the paint every couple of threads into it. I'm thinking of soon applying the loctite jaming the power tube into a padded vice and taking a wrench to the #$%@!ing vertical adapter, attempting to screw it in even though its tight as hell.  Any instialation tips from anyone who has instaled one themself would be appreicated.                                       Kryton