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Here are the photos of the ignition removal. The Yellow arrow shows where the allan head screw comes out of the cylinder. You can see the coresponding threaded hole in the ignition cylinder. The Red arrow is the hole used to depress the catch. The catch is the brass plate - That is the thing you need to press down.
The top photo is of the back of the ignition and where the wires go. MAY NOT BE CORRECT, but I took the photo so I could put it back how it was if a wire dropped.