The retainer cord is the "basis" macrane knot. One log length and one short length of cord. The long one about 2&1/2 times the length of the shorter one.they rap around the plug to make four strands with the shorter two in the middle., the longer two. one on each side. The central two do not move, the outer two are tied in an over hand knot around the central two. Kind of hard to explain but easy to do after you get the hang of it. The resulting cord will sprial.
