The ignition switch tumbler assembly is broken in my 98 Explorer sport and I need to replace it. That means the new key that matches the new tumbler will need to be re-programmed. Problem is that the old key will not then go into the new tumbler to do the on-board programming, and I only have one Smart key for the car anyway, the factory manual says I need 2 original Smart keys to do the on-board programming. How do I get this job done? Is there another way I can get a new lock assembly and matching Smart key synced to my truck?