I have 5 links in my chain. If i recall, i bought the links at home depot, they have a cutter. As for spinning the chucks around your hand, Pug did much better job trying to explain it than i could. There are 5 different and unique spinning moves i know,meaning, not just variations of one. It is fun to make the videos so i am going to make more. I will do "how to" videos. I always break the moves into fighting moves and spinning moves. Not that i would have the ability to fight with them, thats just what i called them. They are a great tool for hand speed, coordination, strength and a lot of fun. Unfortunately, everytime they come out, some billy bad ass feels obligated malign ones good intentions. Not that that happened here, but in general.
Thom