The single-strand Double knot is just an extension of the Simple knot. Being considerable bigger than the Simple knot though, it is an ideal terminator for a Slip knot.
That is, the Double knot will not allow the end of the line to pull through the turns of the Slip knot, once pulled up tight against the turns.
On this site, there's more kite-making info than you can poke a stick at. :-)
Want to know the most convenient way of using it all?
The Big MBK E-book Bundle is a collection of downloads—printable PDF files which provide step-by-step instructions for many kites large and small.
That's every kite in every MBK series.
Another possible use is to prevent a Prusik knot from pulling through, since they do tend to work through a bit after being locked and unlocked numerous times. So far, I haven't had any trouble just using a Simple knot as the terminator. But you could use the Double just for peace of mind!
As mentioned earlier, there's more kite making on this site than you can poke a stick at. :-)
Want to know the most convenient way of using it all?
The Big MBK E-book Bundle is a collection of downloads—printable PDF files which provide step-by-step instructions for many kites large and small.
That's every kite in every MBK series.