It's kind of tricky in that you have to get the two little plastic pieces that have ends sort of like a drive center (hope I'm using the right word for what I'm thinking of) put together right, and then you have to push them into the pen tube, using teh refill, and it takes some finesse to get them to poke up all the way through the opening at the top. If they don't come up far enough, you can't screw the gold clicker part on.
It's certainly not the easiest kit to put together and sometimes I think I must be the only person that likes this kit! but I wouldn't give up on your five kits yet, I doubt all of them are bad even if this one is. But if you do want to give up, you could still use the glued up blanks, it's the same tube as the polaris and the executive and (I think) the atlas.