Then check the bar: first unfold and untangle it. Hook the end of the line (connections to the kite) to a fixed point or ask the dealer to hold them firmly. Then return to the bar by sliding the lines between your fingers slightly tight to check for knots or cuts. Assume that any damaged or knotted line should be changed, as well as its twin! Then check the condition of the trim, de-power, safety line, pre-lines, and release and reset the safety. Then check the general setting by releasing the trim (max power) and pulling on the bar: all the lines must be under tension. If one of the line pairs hangs, it is too long! The vast majority of the time it is the front lines that have slackened over time. It is usually possible to compensate by changing the knots under the rear floats to make them longer, but assume that the lines on a bar with a front/rear differential of more than 10/15 cm should be changed.