Gaff jaws and the yardarms of lugsails require some means of holding close to the mast. The answer is to use a short line with parrel beads. Ideally these are made from wood, and can be difficult to find. One source is to cannibalise one of those beaded seat covers often used by taxi-drivers. The things can often be seen in garage sales, at minimal cost. In case you can't find some when you need them, we offer them here at reasonable cost.

These beads are about 5/8" long and the same diameter. The hole is about 1/8" but could be drilled out as much as 1/4".

They should probably be treated with linseed oil or epoxy.