Does anyone know what I can do to make this chair swivel? Currently it is a prop and all the parts move( chair back, arm rests and chair height) However it does not swivel at the base. Also looking at the file in the parm dials the chair is one piece, nothing selectable. I need this chair to swivel for an animation. Or perhaps does anyone know where I can find a swiveling office chair all ready rigged?

Thanks