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There is another instructable here using a bottle cap to move the lens back and forth, and that seems more functional.
The lens described here may not be the most durable but you can build another one for under a dollar and it is stiff enough for mostly any indoor use.
The idea behind this lens is not so much function as the unique visual effect you get when you take photographs through non-photographic optics. It also aims to teach that a commercial lens is nothing more than a hollow darkened tube with an image forming element.
Hope this clears things up a little.