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||Oh, Dreydl, dreydl, dreydl
One's not enough to like.
So I'll spin two together
and ride them for a bike. (+)
||Wait...if these two tops are counter spinning then each will precess in opposite directions.
Anyway the rider leans will just cause it to turn in place.
||A uni-spindle might work. Also, no need for all the
platformation. Just ensure that the top has a small spike in
the middle (or a foot which does not spin with the disc).
Have the underside of the top shallowly hemispherical, so
that leaning more or less puts it in contact with the ground
at a greater or lesser radius from the neutral centre-point.