Ignition cylinder lock replacement: I need help.

aditional details...
&5 model will have a steering wheel locling mechanism. That notched plate almost completely covers the tumbler retaining pin/hole. It is possible to poke a small tool around that plate and push the pin in provided you have the key. The switch must first be turned to the one position , otherwise the pin wont push in. Without the key you will need to remove that wheel locking plate and drill out the tumbler retaining pin. Good luck