cornucopia72 : I should point out that if the rim is physically bent this may not solve the problem.
Also I use the same type of spoke wrench (for some reason almost always on 14). You might want to spray a small amount of lube into the spoke nipples in case they are a bit seized or you risk breaking a spike. And when you are done, if you made a largish adjustment (tightening) you need to check the end of the spoke is not above the top of the nipple when viewed from inside the rim. If so grind down the end so it cannot puncture the tube.