Do a search on anchor chain splice, as been well covered. Also see <A target="_blank" HREF=http://www.jimmygreen.co.uk/chandlery/anchorplait_splices.htm> Jimmy Green’s site </A>
If splicing octoplait to chain for the first time, recommend that you get an octoplait that has different colours (such as that supplied by Jimmy Green) as it will make the task that much simpler. If you buy from them, you will get a book with appropriate drawings to be able to do the splice, and it is very easy (IMHO) /forums/images/icons/smile.gif
only splice the rope into the chain if it needs to run over a combination gypsy, otherwise use an eye splice and a shacle to reduce chafe and increase strength.