Take a drill and dismantle it then get a circular piece of wood, cut a hole in the middle, and fasten the drill to it, mount it to a base and get a sufficient power source
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rotator
not sure, counter rotating propeelers is extra weight and engineering complexity (more to fail) and costs more
No
Shaft center to center
A shaft is usually longish bit of rotating machinery, made to transfer rotating power. Eccentric means off-center. Either the shaft isn't round, or it's not mounted at the center of wherever it it.