I have a seventies acoustic Epiphone nothing fancy, plywood construction, etc. The thing is this guitar sounds so good and stays in tune through temperature changes, hard hammering and other forms of performance anxiety induced stress. It has a warped neck and gets harder and harder to play over the years. I tried to adjust the neck and discovered that the previous owner had stripped the steel adustment rod. Is it possible to replace the rod without ripping the whole thing apart?