I found that the freshly painted tailgate had a seized hinge when I came to fit it, I got it 2nd hand and didn't check the hinges. The hinged move a bit but when on the car it wouldn't close properly without bending the mounting point on the car.
I cut a complete hinge off my old tailgate but it made a real mess of it getting it off in one piece. I decided that cutting the seized hinge off the freshly painted one would also make a complete mess of the paint work so I chopped both hinges in the middle and welded them together. I cleaned up the welds and sprayed it with zinc primer. Here are some pictures: