I've bought from the fellow in Poland and been pleased with his response (and price).
There's a braid called a four-way sinet that ship modelers use for chains on 1:700 ships. It's tedious, and I'm not sure what size thread or wire to use for N scale. I used a random modification for some of my chain but, for the life of me, haven't been able to repeat it since making about six inches a few months ago.