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I learned about this on an infomercial-or I could have been dreaming, I really don't know. Anyway, this is a fun project. I make them a lot.

Step 1: Materials

You will need:
- two toilet paper tubes
-four paperclips about the same size
-two rubber bands about the same size
-duct tape
-scissors

Step 2: Making the Inner Tube

As you will probably notice, the tubes won't fit together. We will fix that. Take one of the tubes and cut a line down it's length. Then curl it back together with one end overlapping the other a little bit Finally, Put 1 to 2 layers of duct tape around it.

Step 3: Attaching the Paper Clips and Rubber Bands

Loop a rubber band around two paper clips. The paper clips should be at opposite ends of the rubber band. Make a second one. Consult the picture if you need more detail.

Step 4: Attaching the Whole Thing Together and Firing.

Clip two paper clips onto the top of the larger tube so that the rubber bands are on the inside. Clip the other two on the inside of the smaller tube again, if you need more detail, consult the picture.
Once you've completed this step, pop a ping pong ball in the front, pull back on the smaller tube and let go.
Mine comes apart every time I shoot it, with all clips & both rubber bands ending up on the smaller tube. Is that supposed to happen, or did I not understand the directions?
Are the upper paper clips attached to the outside tube?
The way I put it together, for each rubber band there is a clip at one end of the outer tube and a clip at the opposite end of the inner tube. The rubber bands run between the tubes.
are you pulling the inside tube from the inner paperclip end or the outer paper clip end? In the picture, you should be pulling the top up
I'm pulling the inside tube from the inner paper clip end, the end I think you are calling the top.
What exactly happens when it falls apart?
The problem turned out to be with the positioning of the rubber bands in the paper clips on the inside tube. The rubber band needs to be placed so that the clip lies flat against the tube. Now I am a successful ping-pong ball launcher.
Cool!

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