Hey I wonder if lignum vitae couldn't be used? After all it has been used for pulley blocks on old ships because of its hard and smooth properties. But one cuemaker told me its too oily and wouldn't hold glue as well. Or is it too much work for too little advantage? I like wood thread joints but everytime you tighten the butt in you feel like are condensing the wood a little and few years down the road the hit suffers.