Place the sleeve which carries the disc on to two arms of the marker. Place the disc and x with safety pin without too much tightening of bolts (Figure 1). Find the space (L, Figure 2) to which reference furrow should be plowed with disc by using MARKER ADJUSTMENT TABLE. Put the disc in right space, move it to down gently and tighten the bolts rmly (Figure 3). The best working position of discs for normal soil is shown with picture A in Figure 4. Bring the disc to position that shown with picture B in Figure 4 for hard soils.