a means for attaching the blade to the drive shaft;

a mixing body, disposed about an axis of rotation defined by the drive shaft attaching means, the mixing body having, when viewed in profile, a pair of rays that extend outward, forming an obtuse angle, from a vertex, the outward ends of the rays connected to a pair of curved arms that come to a noticeable but blunt point at a bottom of the body, the vertex and point aligned along the axis of rotation; and

an elastomeric sheath, disposed on at least the pair of curved arms, the elastomeric sheath further comprising means for wiping a surface proximate to the mixing body as the mixing body is rotated by the drive shaft.