round magnet cut in a wave pattern on the surface
above an opposing magnet or repelled magnet rides on the wave
this magent is attached to a plastic arm on the bottom
on top quite a bit higher is a magnet facing perpendicular
above this magnet is another round piece this piece plastic containing magnets hanging from above
so as the thing turns the perpendicular magnet actuates up and down at key points to push the other magnets to keep the device spinning if this dont work turn it on its side and add gravity!
This is my stab at overunity with magnetics...
hope this works or gives folks some idea's