Abstract: An apparatus is disclosed for an adjustable movable unit for a spiral separator seed cleaning machine. The apparatus may take a variety of forms depending on the particular spiral separator it is to be mounted upon. The movable unit mounts on a rod and is movable about that rod. Attached to this unit are one or more fingers which act as seed dams upon the inner flights of the spiral separator. The number of fingers corresponds to the number of inner flights. A set of these units attached to a rod is fixed to each half of the spiral separator. On the normal double spiral separator in use in most soybean seed cleaning operations, two sets of adjustable units consisting of four units each are required.