No special tools required. It just has a tab on each end of the long cover over the tumblers and springs. I think I used a small screw driver or a scribe to pry the end tabs over as I held a thumb on top of it. As I mentioned before, be very careful as you slowly release pressure on the long cover as the springs are under pressure. If you relieve pressure too quickly, springs will end up everywhere.
Sorry, I don't have any pics. I didn't have a camera the last time I pulled one apart.
