I would like to hear from you what is the knot to use in the chaine (rope) to anchor, in the part (sorry, I do not know the name) as following picture.
Please put a drawing, not a long description as my "marine english" is not good.
Normally you would attach a length of chain to the anchor using a shackle or a swivel, then splice the rope to the chain. If you use * plait rope, then it's very easy to splice onto the chain.
Would you attach the rope to the bow roller, to one cleat or to both cleats?
It depends on how well made it all is. I wouldn't attach it to the bow roller, but one cleat may be sufficient. From the picture it seems to have been made without any real thought as to how it would actually be used!
One solution may be to tie the very end of your anchor line onto one cleat, use the bow roller to lower the anchor, then tie off onto the other anchor when you have let out enough rope.
