I found one with actual screws securing the case and circuit board.
Purchase a clock mechanism with a 3/4 inch long shaft from a hobby store.
I could not remove all the screws, so I was forced to pry off the cover.
Be carefull not to damage the insides.
You need to remove the hard drive platters and spindle.
I used a T6 torx wrench to remove the 3 screws.
Use a hammer and a larger screwdriver to pound out the ball bearing sleve.
When both are removed the hold that's left is 1/4 inch.
Attach the hands and insert a battery.