To answer the question posted above, the shape of the Pirate Skull by Lindberg (
http://www.lindberg-models.com/71302_pirate_skull.htm) allows me to drill a small hole behind the jaw and extend the rod end male threads through that hole, attaching a nut on the either side.
I had to bend the threaded end of the rod end slightly to acieve the correct angle. This was done by putting it in a vice, heating it up a bit placing a steel tube approximatley the same diameter around it and banging it gently with a hammer. Be careful not to damage the threads or snap them off. I would buy a couple extra rod ends for practice. I didn't need much of an angle, maybe 10 or 15 degrees. I didn't measure, I just did it by eye.
In that last picture, you can also see where and how I mounted the Jaw servo into the plexi plate and attached the jaw wire through a hole drilled in the skull. Exact location of the hole is not important. just find a spot that doesn't show too much and allows you to hook up to the lower jaw.