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jmenomeno: One wheel set is 20 bux, two are 30 bux.
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jmenomeno: Technic hole
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jmenomeno: Or another...
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jmenomeno: Controls can be linked one way...
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jmenomeno: With wheels attached. Can also be linked with another set to do tank steering.
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jmenomeno: Go brick from ThinkGeek...an IR remote and motor on a 2x4x3 area.