Used to have a tool somewhere here. Lisle 65750 is about the closest. Leave wiper down, lay flat part of tool over arm pivot and the part with little fingers reach down and grip under back edge. Then you lay palm of hand over tool handle while reaching under wiper arm. This sounds way more difficult than it is sorry. All you are doing is rocking it back and forth while lifting it up. If the splines are not corroded it only takes about 5 seconds. Don't try to pry against any sheet metal.