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OT: Spinning wheels

Ok, I know I just made a new thread, but this doesnt suit a mat thread.

Anyhow, we have to make this balloon car for physics, which is to be powered only by a balloon. I have my idea, but I need to know hgow to get the wheels to spin. I have a box, and I want to poke holes and stick like a straw or something through it, and then put CD's on the end. But, if I glue the wheel to the straw, then the whole straw has to move, and it would be insecure in the box, and slide left and right most likely.

Now, if I glued the straw to the box, and put something thinner and longer through the straw, and glued the wheel to that, then it would say, but I dont have that thing that is thinner and longer then a straw :p.

Now, I have to do this for tomorrow, and yes, I know I should not have left it until now, but there would people that said they would help, but oh, they're not here... And I know how bright all of you forumers are :D

So anyways, any help is appreciated
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