The ignition switch in my 65 pops right out when I turn the key to "on" or "start". While the car is running, I can pull the key and cylinder right out of the outer chrome housing and the car keeps running. I have been told that there is some kind of pin that actually holds the cylinder in. Is this true? Can this be fixed? I don't really want to replace the cylinder because then I'll have to replace the door cylinders to have matching door and ignition keys.