For this Instructable, I'll be using an old WD Caviar hard drive. Drive designs differ, and some are better for this project than others.
You will need:
Torx-6 and Torx-8 screwdrivers
Phillips head screwdriver
Drill and bits
3/4" clock movement
Once you've gotten all the screws, you can cut through the tape around the edge and open it up.
Step 2: Disassembly
Then, remove the single screw keeping the actuator retainer in place. Work the retainer up and out. The arm should swing freely now.
Next, unscrew the motor assembly and pop it out.