The front lines of a bar are subjected to higher loads, so they may stretch usually over time. It is possible to stretch the lines unequally by practicing freestyle tricks in one direction only.
For this reason and to maintain the high performance of your kite it is important to check line lengths regularly.
1. 0:07 Checking line length
2. 1:21 Adjusting outer lines (steering lines)
3. 2:05 Fixing the knots
Please also see "My kite is flying strangely, what can I do?"