How to trim/cut a hedge straight

How to cut / trim a hedge straight using a string as guide. Demonstration on a hedge with constant height and a hedge with irregular height. Home house garden improvement construction finishing do-it-yourself diy tools. This video does not constitute or replace a real specialized technical manual, and was only made ​​for convenience and educational purposes. "Tuto4BuildEng" makes no warranties of any kind and accepts no liability. "Tuto4BuildEng" cannot be held responsible for any damage caused to devices or persons using information contained in this video. The use of the information contained in this video is at your own risk.