1970 Dart radio removal tips

here's some pictures, I hope they help. Just for kicks, I tried to pull the center knob off without the ring and couldn't do it, but both came off pretty easy by pulling on the outer ring. When you put it back in, put the ring on first (it only goes on in 2 positions) and then press the center knob on.
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Thanks so much man I appreciate it. Pictures like that are nearly impossible to find on the web.
I will give it the 'ol college try again later when I get home. I did not try pulling on the outer rings because i had no idea how they were connected or if they came off at all. Thanks again =)