I have decided to replace all ignition switch components on my 1990 sl300 r129s. Have had issues with the key locking up, but it turns now. I have the entire assembly loose and disconnected, but am unable to remove the electrical plug. I am at a loss on what to do. I press in the little button and have the key in position one, but can't even pry it off. I certainly don't want to break it. Thanks ahead of time for any suggestions.