Has anyone taken one apart without damaging it? I just got a 30's era crat which I'm going to get replated. At times it feels like it catches when turning the mechanism to open it. I can feel a "click". I wanted to get a look at the shaft to see if there is corrosion causing it, but I don't see any obvious way to do this without trashing it. Is there a trick to disassembly or is it just out plain of the question?