Amazing dangerous building demolition skill! This video is simply amazing.What was so dangerous (well, in untrained hands they are) and homemade about these machines.The single worst thing about most of these clips is the person holding the camera. It would be nice if someone knew how to film without shaking the camera all the time.Thank you for uploading and sharing this well researched and well documented video. By watching videos such as this on YouTube one learn a lot from the comfort of our homes. Well done ! Keep recording and uploading and sharing videos like this !