Motor apparatus comprising an elongated motor shaft (212) having a shaft axis and means (328, 216) for supporting said shaft for rotation about said axis; first spring means (320) for applying a first torque in a first rotational direction to said shaft; second spring means (322) for applying a second torque in a second rotational direction to said shaft; and means (284, 286) for selectively releasing the torque of at least one of said spring means to impart rotation to said shaft.