I know I've seen mention of it before, and I'm usually good with such things on my own, but the case on my Filco (104) is fighting me, and my search-fu is failing. What's the trick to release the tabs on the front of the case, or can someone point me to a pic of it apart? Just don't want to damage something expensive... (although the odds of that happening anyway are pretty good, with what I have planned )