1. error - the blade will break off when it meets the stone and it will easily break through the thin casing, it is possible that the foot is in the leg. 2. Error - the bus connecting the motor shaft to the blade fasteners is very weak and easily breaks. 3. Error - with this rotation, the thread on the fastening nuts should be left, otherwise they rotate with strong rotation. 4. Error - the engine is very weak and can burn out in a very short time. since it is not designed for such a load. And the downside is that with such a trimmer you do not mow much..