I ended up replacing the hinge because there was way too much play in my original hinge.
I am also going to replace my existing home-made ball mount. It does not have nearly enough range to be really useful, but it should be functional enough for a few tests tonight.
Here are the final couple of shots of the assembly and the final product.
With any luck first light will be tonight.
On a slightly related note, my FOV templates that I made got cut at ponoko today and should be arriving soon. As soon as they get here I will do a writeup with some details and pictures.