Pulling the radio out won't help unless you want to take the radio itself apart. That is probably possible but an easier way may be getting a very strong vacuum over the jack. Really depends what's been jammed in there. If it's the tip of a male jack I can think of another possible thing to try but try the vacuum first. Gonna have to be a very strong vacuum.It might be, could I take the stereo and find out or is there an easier to remove the obstruction.