I read once that Meucci used to bore the hole just undersized, and pressed the pin in rather than threading it. It was supposed to make it go in straight & center & strong. From what I have seen, it's a good likliness that it's true. I have never pulled a Meucci pin out that brought wood threads with it, just epoxy. If this is the case in your cue, then unscrewing it should still work but I found an easier way to just pull it out.
Heat it up to break down the epoxy, then put a 5/16" hole flat washer on it & a nut threaded down to the washer. You can hold the forearm & use a wrench or socket to turn the nut & this will pull the pin loose. It gives even pressure & with the flat washer you won't damage the joint face or plastic collar. It's easy. You'll be using the power of the threads to do the work for you. Even if the pin is threaded in, it'll pull out bringing the wood threads with it. I'd try the already mentioned techniques first, but if it's not happening then give this a try. It works. You may need to bore & plug the hole to anchor the new pin, but that will likely need done in the case of a bent pin, anyway.