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Get yourself an electric motor, and some big hunks of plastic.
Make your own plastic pulleys.
Install them.
Done.
You'll save more weight than aluminum, most plastics will stand up to the belt drive without any trouble, and you can do it completely free.
It's really not too difficult to mill plastic... if you can center a hole in the blank, and then mount it on a bench grinder or something, you've just created an easy lathe-type setup.
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