I've recently begun to collect a few clocks, and my wife added the pictured clock this past week. I have not tested it as yet to see if it works correctly, but gave it a quick clean-up. I pulled the 'ring' on the back left as shown in photo 2 to see what it does, but it appears it has disconnected the clock movement? - something is moving around inside that wasn't before. I need to confirm the to open this clock that I would remove the three front bolts and remove the hands. Any help to a rookie would be much appreciated!