1. Use clippers to cut off the handle of the toothbrush, leaving only the toothbrush head with the bristles.
2. Bend the bristles to make sure they are all angled to one side.
3. Add two bits of wire to the pager motor.
4. When you place these wires on the terminals of the battery, the motor will vibrate.
5. Add a bit of tape to the top of the toothbrush head.
6. Mount the motor on the tape. Make sure it rotates freely.
7. Fix the battery on the tape between the wires of the motor s0 that one wire is below the battery and the other one clamps down on top of it.
8. Put the Bristlebot down, and watch it go!