Step 1: Let's get starting...
1- A clock with a quartz movement. I've choosen this one because it has no numeric marks.
2- A screwdriver
3- A cutting pliers
Disassemble the body of the watch to get access to the movement and the hands.
As this varies from clock to clock Ieave this step for you...
Step 2: Remove the hands and the movement
Step 3: Disassamble the movement
Remove all the cogs in the top part of the movement. Then carefully remove the electric part. Be as careful as you can. The wires of the electromagnet are very thin and fragile. A false move and the movement turns in to trash!