Racing kites use 22 thin lines (called the "bridle") that connect the bar to the kite's canopy. Over time these lines stretch unevenly, which warps the kite's shape and ruins its performance. This spreadsheet is a retuning calculator: you measure each line, type the numbers in, and it tells you exactly which little correction knot to tie in each line — and how to adjust your bar — to bring the kite back to its factory shape.
The workbook has 11 tabs for the Ozone VMG2 kite (FS21 = the Formula Kite squad design):