How to prevent striping of fertiliser
Striping can sometimes happen but is easily fixed. This usually occurs when the skirt rubbers need adjusting. Fertiliser can leak out the sides or the front of your bin causing an uneven spread (striping).
The side-skirts (running the length of the machine, inside the plastic bin) and the front and rear bin rubbers will require fairly regular adjustment. Particularly when the machine is new.
The skirts and rubbers are bolted to the machine. These bolts can be simply loosened and the skirt or rubber moved so it is flush with the floor-belt. They should fit firmly and you should not be able to see any daylight between the rubber and the belt.