This adjustment feature is shown here on the our newest sweep oar. It is also available on all of our sculling oars as option at the time of purchase. These two new white nut locking couples engages both the red nut and segmented screw and moves the bearing surface (sleeve and collar) laterally. For every 360º of nut rotation the sleeve/collar assembly moves along the segmented screw 1cm. The couples lock every 90º of rotation. So the inboard outboard adjustment can be made in 0.25cm increments. This design is offered on all our adjustable sculling oars and our newest sweep oar shown here.