Ponton, Horn does not work, Mechanical Question

I have a Ponton se-220 from 1958. The horn does not work so I want to check the swith. To do this I need to remove parts of he steering wheel.
This is where I get confused. Exactly how do I remove the center plate (the plate you press to activate the horn)? Is it just snapped on or what?
All help appriciated. Best regards, Bengt
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