Greetings to all
First, I have to say well done and fine effort to everyone involved in setting up this site. Something like this was way overdue, and to see it done in the UK gladdens my heart even more.
Lots of useful information here, but I don’t want to just take without giving. So here’s the thing:
I can’t help but notice the growing interest surrounding U-swivels, and the related debate about what’s best: swivels vs bearings vs cord. This is my small contribution...
First, a bit of context. I am old. Really, really old. In fact I am 43. So I have seen lots of things come and go, which brings us neatly enough back to the subject of swivels.
I started nunchaku training when I was 20, and back then you could still get U-swivel nunchaku in the UK, although they were fairly rare - I only remember one type, non-tapered octagon (hakakukei) in 12" or 14" reddish wood of middling weight. I have no idea if these were the fabled Dolans, or some Far Eastern knock-off. Dolans seem to be pretty much a Stateside thing when they were around, but these were available over the counter in most decent London martial arts shops. Remember, back then, there was no Internet...
I have to say that U-swivel nunchaku did not enjoy a good reputation for durability and safety, or for handling, come to that. In fact everyone I knew either went for cord or ball bearings. I have a very strong feeling that this is the reason why swivels just died out: people simply did not buy them. Let me repeat that: no-one I knew used them, or had a good word to say about them.
I have two pairs of good quality ball bearing nunchaku that have seen some use over the last 20 years and are working perfectly, although they look their age. I have newer sets with Dazzle brand bearings bought from Woodalls which are also working perfectly. While I have no doubt that a cheap bearing could fail, I really feel that the supposed unreliability of ball bearings in general is being overplayed in some quarters. Buy quality and you will be fine. Buy cheapo Chinese junk and maybe not.
I'm certain that the sheer rarity of swivel nunchaku is behind the mythology building up around them. If the technology was so much superior to ball bearings, it would now be dominant, not the other way around. Again, let me repeat that – if swivels were so good, they would now rule the world, surely?
Finally, I must say that over the years I have (reluctantly at first, sure) come round to the absolute certainty that cord is best. Corded nunchaku are better balanced, faster, snappier, easier to control and quieter to carry. They are also utterly reliable – you can’t get sand in bearings that you don’t have, and milspec paracord or similar just does –not- break

So there it is, posted in the humble hope that it might help.
Respectfully
BBD