Greetings, and welcome, pea!
I can't speak for everyone, but I've never shortened my brake lines in a way that required any additional knots.
Much like a Microsoft product, we shorten lines by first lengthening them!
If you add a piece of parachute cord or 750-lb flying line the bottom attachment point of each handle on your kite (about 12-18 inches long), then
attach your brake line to this, you can tie simple, overhand knots in the cord, to lock the adjustment point on your brake lines. Your brake lines,
of course, will need to be shorter than your top, or "flying" lines, to accomodate this extra length of cord. However, as your top lines stretch
through use, your brake lines will become shorter, so don't over-shorten... use the cordage to adjust lengths. Figure out the length you need, then
tie an overhand knot at the anchor-point for each brake line. Tie only one knot, which is easily moved, later on, for further adjustment.
When tying loops in your flying lines, don't use a simple, overhand knot or slipknot... find out how to tie a "figure of eight" knot. This method
reduces the stress of the line at the knot, so that the knot does not become the weakest link, or at least not weak enough to break repeatedly, as a
simple knot most certainly will.
As Corey Lama taught me, I make all adjustments at the handles, rather than up at the kite, and if set up this way the first time, the lines are
quickly adjustable, in the field, throughout the life of the lineset.
-Dooley :moon:
Mike \"Lack-O-Slack\" Dooley
\"Nothing is foolproof, to a sufficiently talented fool!\"