Now that we are ready to insert the fifth and sixth links we need to illustrate the concept of single-backed and double backed. The true Roman Chain is always double-backed which means that each link must be threaded through the last two. Threading or weaving links oscillates from one axis to the other. It doesn’t matter which side of the chain you’re going through. Look through the top of the chain to assure yourself that you are going in the right direction. As I understand the dynamics of the process, single-backed chains can be produced by machine but not so the double-backed.