Abstract: Disclosed is a removable, replaceable assembly for supporting a file system of the type which has a plurality of separator cards each of which is centrally apertured near its bottom to receive a locking rod. The cards are assembled behind the other. The assembly includes a pair of spaced parallel pivot rails (2, 4). Each rail has an upper pivot surface (6) lying in a common plane on which the bottom portions of the cards are supported for pivotal motion. Means (10, 36) join the pivot rails together and are located below the pivot surfaces of the rails. A locking rod (20) is located midway between the pivot rails of extends parallel to the rods and passes through the apertures in the separator card. Rod retaining means (24) extend upwardly from the joining means and are releasably engagable with the locking rod. The retaining means are apertured to position the rod between the rails at or below the plane of the pivot surfaces of the rails.