Okay, the first thing you will want to do is gather all of the necessary parts. They include 1 pencil with ereaser, two dried out old click pen parts, a piece of 8in. long PVC pipe, 1 dead light bulb, 1ft long piece of 2 by 4, a elastic band, one metal paper clip, aluminum foil, see through tape, one small toy motor, 9 volt battery, and some junk wire. A good sense of humor and a few band-aids would come in handy too.
Step 2: Part 1
The first step is to take your 1ft piece 2 by 4 and drill 1in. deep with a drill that is wide enough to snugly fit your PVC pipe. The position where you drill the hole should not really matter just as long as there is enough room to work with.
Step 3: Step 2
The next thing you do is stick the PVC pipe into the drilled out hole, and mark the point where the axel of your motor touches PVC pipe and drill a (STRAIGHT) hole through both sides of the PVC.Then drill another (STRAIGHT) hole through both sides of the pipe at the point were your elastic band is lightly out stretched. Make sure that elastic band is not too tight or it will stop the motor.
Step 4: Step3
Next you drill two more holes into the PVC.The first hole should be drilled directly perpendicular too the bottom holes, and should only go through one side of the PVC.The second hole should go just above the top hole and should also be drilled through only one side of the PVC.
Step 5: Step 4
Now you need to clean out any ink that is left in the dried out pen parts. I used a ribbon tie like the ones that come with trash bags to clean out the pen.