How to Make a Pocket-sized Bristlebot

In this Instructable, I will show how to make my version of a bristlebot.
It is small, easy to make, and uses very little materials.

Pros:
-Very little materials
-easy to make
-Fun to play with

Cons:
-Tends to spin in circles
-You have to get the balance right
-uses a special type of toothbrush

***UPDATES!*** (as of July 20, 2009)

I found the perfect toothbrush head!
Use the Exact Cross-Bristle Toothbrush I found at Superstore and it will go straight!

I give most of my credit to http://www.evilmadscientist.com because I discovered his bristlebot after I published this Instructable.

Here are the materials you need:
-1x vibrating pager motor
-1x toothbrush head (bristles have to be angled as shown in picture 2)
-1x cell battery (any type, has to be between 1-9 volts)
-a piece of foam tape (already attached to top of toothbrush head)

Take your piece of foam tape, and put it on top of your toothbrush head.Then place your motor on top of the toothbrush head, making the weight stick out over the top of the toothbrush head.Then stick a wire from the motor on to the foam tape and put the battery over it (any way). Stand it up and make sure it is well balanced. You are done!

Just place the other wire over the battery and it should work. Enjoy!