The lock plate is retained at its center with a spring clip, but the plate itself is under spring tension. The easiest way to remove the lock plate is with this special Lock Plate Removal Tool (shown in a factory illustration). Theyre available at parts stores, dealerships, or you can fabricate your own out of bar stock. Crank down on the lock plate and remove the spring clip. The lock plate will come off when you remove the tool. Remove the coil spring and horn contact.