A modiefied sprocket carrier is glued permanently tot the Campagnolo Record road hub. The ring is not a standard track lock ring (the hub does not have the special left-handed thread for that) but an old bottom bracket cup lock ring. Those have the same thread as the classical hubs. The carrier keeps the sprocket in place, even when braking or skidding. The ring just keeps it from running of the carrier without having to block the backward forces that a normal lock ring would have to.
