You will find soon here some helpful tips on kite lines DIY, tuning and maintenance.
Kite line splices and methods for splicing: standard sewn splice, Brummel locked splice.
Splice length and taper.
Sleeved & sewn loops.
Line stretch/elongation and shrinking.
Abrasion resistance and strength loss.
Air drag - diameter and cross section shape. Whistling/vibration.