A hollow kite control bar is provided with means for sliding access to the bar for one or multiple lines or groups of lines. Each line has one end towards the kite and the other towards the bar. The length of each line between the kite and the bar can be adjusted by pulling into and releasing from the bar, which length or lengths can be locked at multiple positions in one or more locking means fixed to the bar. The excess line length pulled in is automatically held inside the bar.