2007 Mada 3 Radio Buttons
 

Hi all, I've managed to score a used head unit from ebay to replace some damaged radio buttons on my unit like the AM and FM1 +2, I'm going out on a limb here and hoping someone knows how to exactly remove these buttons so when it arrives I can get straight into it, apparently there held in with a small white pin, if someone could explain exactly how to do it it would be greatly appreciated.
Cheers