The motion of a gyroscope can be described by a double rotation. One can get one to precess about its center of mass by placing it on a glass tabletop so that the bottom of the spin axis skates across the surface. This gyroscope is spun up by a piece of string while holding the outer frame. It might help to do this at an angle and give a little twist as one sets it down to get it to precess about the center.
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