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Re: pic: Team 610 Off-Season Tank Drive Prototype
I don't know if it's worth the hassle of dealing with ordering from the US, but onlinemetals.com has 3"x3"x.125" tube.
http://onlinemetals.com/merchant.cfm...owunits=inches
1/4" wall is an enormous weight penalty and very likely much too beefy for nearly anything you'll throw at it.
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--Madison--
...down at the Ozdust!
Like a grand and miraculous spaceship, our planet has sailed through the universe of time. And for a brief moment, we have been among its many passengers.
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