1971 Duster Horn Button Removal

I am about to replace the turn signal switch on my Duster and the only confusion I have is the removal of the horn button. I have seen several threads on this, but none seem to work. It appears the most likely one is to turn the button counter clockwise while holding the steering wheel. I tried this but it did not seem to work and I did not want to force it. Any suggestions will be greatly appreciated. DASH.JPG