While stationed in Korea about 15 years ago I picked up a Les Paul Standard. Recently there has been a buzz in the lower frets. I took it to my local guitar store to ask them if they can help with the problem. They told me it is a truss rod issue, but it is a brass nut and then did not have the correct tool to adjust it without damaging it. I should have asked more questions, but left. Now I want to just buy the right wrench and bring it to them to fix. I live in the middle of nowhere Georgia so my music store options are very limited. Does anyone know the correct size (I am assuming it would be in millimeters). Also, has anyone heard of a brass nut tool VS a non brass nut tool? That was a new one for me. Any additional info would be helpful too (where to purchase...etc).