Hey Chrisso, Ive replaced a lot of these, as Best used to be a newbie kite brand, if it keeps happening to your bro, go to a sewing shop and get a little steel rod with the hook on it, you feed it as best you can then grab the end and it works, you tend to pull one piece of the brraided line and it stretches a bit, but you wont snap it. after its all good, re-trnsion the loop with the sewing thingy,. 5 mins tops.

. get your brother to depower his 11.5 for Perth conditions, a line under tension and friction will rear regardless of the brand of bar and lines.