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I found that the brass ring is a push fit and by putting the unit face down so that the glass is supported - I used the rubber washer from my clock (it is in a tea caddy tin). I then applied pressure round the edge of the brass ring until it eventually separated. But be gentle! Good luck.
I sent my clock off to Seiko for repair, useless, they said it was in the circuitry. I had them send my clock back. I ordered a new gear box $2.00, replaced that, it will work as long as it's flat. If you look you can see how the clock cycles I made sure it was "locked" in (you can hand force it) then I removed one of the gears so it doesn't cycle down but stays in the up position at all times. Music plays, lights go, just no motion now. Call Seiko for replacement battery cover.
I haven't much experience of this type of clock. A friend has such a quartz pendulum clock and I was surprised to discover the pendulum has no direct mechanical contact with the clock motor and as long as the motor draws some current from the battery the pendulum will swing due to the resulting influence of a small electromagnet.
I guess the quartz mechanism is at least electrically ok but somewhere there is a mechanical fault preventing the hands moving.
A typical quartz clock motor is fairly simple and dismantles easily to reveal only a few internal parts that can be examined under a magnifier to determine the probable fault - dust, burrs or excessive wear.
It is also worth making certain the clock hands do not bind on each other or the clock face.
If you're down in hole, or if the signal is somehow otherwise blocked, the clock may never sync with WWVB. Otherwise, you need to try it in different locations and facing in different directions. Some folks place the clock outside once a week or so, and face it towards Colorado to pick up the signal.
The clock is searching for a strong enough radio signal from NIST station WWVB. When it can't lock on it, it gives up, moves the dial four hours, and goes to sleep to wait for better reception. Put the clock in a window facing towards Boulder, CO, overnight. (Radio propagation is better after dark.)