Mine was dented really bad on two spots so I had to use a metal file to trim the edges until I could see the edge of the button. That wasn't enough (ie the button did not get released), so I used a fine pick to peel of the button face (thin metal plate) which revealed the inner plastic part. I kept filing + used the pick to get the shape back into a circle and the button finally popped out. I used sandpaper to smooth the edges.
Mine was dented really bad on two spots so I had to use a metal file to trim the edges until I could see the edge of the button. That wasn't enough (ie the button did not get released), so I used a fine pick to peel of the button face (thin metal plate) which revealed the inner plastic part. I kept filing + used the pick to get the shape back into a circle and the button finally popped out. I used sandpaper to smooth the edges.