Don't pry on it. There is a tool made especially to remove these, if you don't have one go to an auto-parts store and buy a 4 dollar battery clamp remover, it works just as well. Also, use a marker to mark the position of the splines to make it easier to re-install. That way you won't have to re-do it when you find that the wiper no longer parks at the proper angle. Just don't pry on it.