An improved corner post mount for pivoting the levers of a platform-type scale. An upright member is molded integrally with the base at each corner thereof, and defines an upwardly facing opening to receive a flat insert. The upright has spaced tapered ledges which seat the edges of the insert that converge toward the bottom of the insert. The body of the insert is captured between a flat surface defined on the upright, which seats flushly against the insert, and an upright edge defined by a rib formed integrally with the base. The body of the insert has an extension which closely surrounds the upper edge of the upright. Preferably, an upwardly facing notch receives the extension. The insert, which is preferably metal, is implanted within the opening of the upright and frictionally kept captive within the base, which is preferably fabricated from a lightweight material, such as ABS plastic, or the like.