Although I am complete beginner with 2taktern and motorized drill holes I could start the engine immediately after reading these operating instructions and Obtain the fuel. The holes in heavy clay soil went in easily. If the resistance of the drill in the ground is too big you have to have no fear that the device is torn out of his hand. Since the engine (or clutch) appears to reduce the torque. Pulled the earth and on it goes. No one can blame that the drill does not get further with large stones. Instead of violence as helps excavate the stone or to smash with an electric chisel. Drilling is also in solidified gravel. This is broken up in a matter of seconds and can be scooped out. The drill can not be transported out of the hole the bricks. Who now and then point foundations or fences built a real recommendation. I needed the power drill because the holes had to be drilled along a fence and a Handboher did not go because of the sweeping handles. The decentralized mounted gearbox allows drilling on all edges. Use hp electric chisel drilling on foundations. The ERDborher can not concrete. :-)