Alright, I have a newer (1996) Fender Jazz, which has the trussrod located in the body, rather then up at the head. I have always adjusted the truss, by simply inserting a portion of a hex rod into the hole, and turning. I recently read an article, that said this could be potentially very damaging to the area around the nut, and to properly adjust it, you should take the neck entirely off. Is this really necessary???