Ok thanks, i think i've got what you have told me so far, i included a screen of my chain, using the circles and parenting them, plus a view of my hypergraph, so you can see if i parented them correcly.
I hope i've don't it right so far.

I also set up the lofted surface and made the riged bodys, but i don't see why I applied the riged bodies to the toruses. Any reason?

thanks again you've been a huge help