Mount guide rails and bearing shells. Place spring shaft into the bearing shells and secure with screws. Be careful! Pay close attention to the placement direction. The arrows on the boxes indicate rol-up gate and roll-up grille direction. Mount roll-up gate/-grill and secure to the spring box with the corresponding clips. The guide tubes of the spring box have six holes on each side, one side for tightending with the pin wrench, the other side for holding a locking lever. Place the pin wrench in the hole and pull downward. At the same time, count the number of holes (6 holes = 1 turn). A mark on the guide tube and the axle tube will help keep count. While tightening or readjusting with the pin wrench, take out the locking lever and reinsert it. This procedure of readjusting (tightening and perhaps loosening) takes place until the tension is achieved.