I knew Y-Pout was a bad example after I posted it!
I think it could be done, using brakes as Daniel suggests. I was thinking of quickly firing a brake onto the floor rather than the wheel though.
Its obviously possible to make a low speed translating spinner, its just a question of how fast you can go.
*Still believes a true spin-drive system is impossible*
Ah, well, if it was possible, thered be no fun in building it
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