Take the clock out. See the black 'trim ring' around the face? You're going to pry it off from the back. The black metal ring is bent/wrapped around a small lip on the silver metal 'can'. Use a tiny flathead screwdriver or other suitable implement to pry up the wrapped portion of the black ring - don't worry that it looks like hell, 'cause the plastic trim bezel will hide it. Work your way around until you can remove the black ring (along with it will come the black adjuster knob and glass face.
Now gently take a needlenose pliers and push up underneath the hands to slide them off of the center post - take note, they are keyed for easy reinstallation. Using a tiny screwdriver (and being careful not to scratch the face), unscrew the two face screws and remove the face/guts from the silver can.
Now that you've got the guts out, you can look for trouble spots. These clocks are notorious for 'freezing' in cold weather (i.e. if it dips below 40deg F the clock stops until it warms back up). You can identify two 100uF capacitors on the very back end of the guts, on either side, on the circuit board. These are the troublemakers - replace them with a new pair from Radio Shack (take note, they are electrolytic, so get proper replacements and pay attention to polarity.) I'm not sure if this helps you (it sounds like you might have a broken connection somewhere), but as long as you're in there you may as well replace them anyway (a couple cents and 5 min vs. having to open this little can 'o' worms again in the future - My clock in my '83 did this, and I had a spare, so I swapped 'em - one year later, the swapped one was doing it!)
Putting it back together is just the opposite - don't worry about a real clean bend when you put the black ring back on, just make sure it won't fall off!
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