Geezer here, regarding reinforcement of nut-sockets. Bone works fine, if you can find solid, un-pithy stuff. I've had my best success with moose-horn... the solid stuff from the base of the antler. I have also used axis stag horn. It's very hard, with only a tiny blood-vessel up the middle. Just remember, there's a difference between horn and horn. That is to say, ox and cow horn are not the same as moose or stag antler. The one is a lamellar growth product, like fingernail. Antler is ivory... as long as you can get hard antler, rather than the pithy stuff, I think it works better for roller-locks, bolt-rests and lock reinforces (lager blocks) Cow horn is substantially more flexible and easier to work than antler. It works reasonably well for lockplates, top-table, butt plates and inlays.