Initial belt stretch and camber (distortion) are virtually eliminated because the Flat Seat® spiral has no surplus wire to distort or elongate. Before every Flat Seat is formed, its round wire is flattened in a rolling mill into a flat, oval spiral. Computerized machines guarantee that each spiral is formed with a precise flatness that is uniformly parallel. The design of a spiral’s hinge area is also critical to a belt’s life. Flat Seat’s hinge is designed with a flat, broad contact area. Each spiral hinge is accurately matched and precisely seated to its cross rod to prevent continuous rubbing of metal to metal.