Not sure what you are referring to on the “centering plug” part of the question. Sometimes when you remove a shaft that had a tip weight the weight can be stuck in the hosel. That could be mistaken for a plug I suppose, but if the shaft is still in the hosel you would not know if that could be it. If you have not removed graphite from a metal wood before, you would need to get some equipment (we carry everything you would need), get some instruction on how to perform the shaft removal, or seek out a qualified golf club repair person. We have some older videos on our You Tube channel you can access at the bottom of our web page that shows removing graphite shafts using some of our tools. If the shaft is broken at the hosel the procedure is different than if it is broken in another part of the shaft. Again, if you are new to this, you might want to seek out someone that knows how to do it. You could also just send the club to us and we can do the repair.