They are threaded on the inside (ID) but I can't tell if they are screwed into the wood or pressed in. There's no way to get a wrench on them. The outside is round and flush with the stock. They could be screwed in. I thought about screwing a screw down in them and loctiting or epoxying the screw in and twisting them out. I'll just have to drill them out and fill in with a dowel. Thanks for all the help. Good luck.