I think it was Doug ?? that mentioned getting one of these. I looked it up and thought it was a worthwhile purchase so got one myself for $31 inc postage. There's a whole heap of videos on using them and various techniques but I think this is a very handy little bit of kit to have if you bust a strap or buckle or need to make one up. A bit heavy for kite repair with the supplied needle but I suspect you could use a sewing machine needle and smaller thread in it - I'll give it a whirl and let you know how it goes. And watch your fingers too - it is, in fact, REAL easy to punch a hole in your finger....or thumb.
Ah, speaking of using finer thread....
Interesting that some videos finish with a couple of back stitches and other vids finish off with tying knots. Some wrap thread around the post while others don't. Looks like there's a few ways to skin the proverbial cat.