Dremel the inside to create a notch where the screw holds on a bit better its cut anyway not like a few extra mills of bone will hurt it at all.
I hang my roe from the eye bone behind the socket its a nice view compared to what's usually done, I tie the lower jaw too, There just hooked on so by the bone so they can be lifted off and passed around for people to look at.
Or for myself to use for art refences.