The MØRCH UP-4 incorporates a special concept of the unipivot principle.
The bearing consists of a hardened steel pivot resting in a concave, polished
sapphire. The bearing is damped in all directions with silicone fluid.
The low positioning of the bearing provides for a greater stability compared to other
unipivot arms. This is because a considerable part of the moveable mass of the arm is positioned
above the pivot point, thus forming a physical pendulum together with the mass below the pivot point.
With the model UP-4 the azimuth adjustment is made by the way of the counterweights.
