Thats great, thanks.  Totally clear, maybe because I've had too much coffee today!!!

I guess this one is quick to make  but the time and skill is in the positioning of the links/chain to get the realism.  
I am finding out that, like most software, Carrara has a  lots of ways to get to the end result, but you have to know which method will work best and have a very clear idea of the end result before you start.

loads to learn but its fun!

Thanks again for a  very comprehensive answer to my simple question. I am sure I will have many more question as travel down this long road that is... learning Carrara.
Cheers
Steve