Beater Attachment

FIG. 1 is a perspective view of a beater attachment according to the design; FIG. 2 is a front elevation view thereof; FIG. 3 is a back elevation view thereof; FIG. 4 is a right side elevation view thereof; FIG. 5 is a left side elevation view thereof; FIG. 6 is a top plan view thereof; and, FIG. 7 is a bottom plan view thereof. The portions of the article shown in even broken line form no part of the claimed design. Dash-dot-dash broken lines adjacent un-shaded areas represent bounds of the claimed design and form no part of the claimed design themselves.