The Flatliner system consists of 3 traction bridges in different sizes, 80cm, 120cm and 160cm long. They all are equipped with exchangeable and multi-functional components. Using the modular principle identical parts can be used to the greatest extent. The single and double feet for the use on concave surfaces are adjustable in height and diplaceable in distance and form. The pull mechanism with patented feed shaft and ball bearing allows a constant and single-handed traction enabling the technician to use his second hand for other work.