I think you can tell which way the leaders should go by the direction in which you roll or unroll the sandwich. For example, the rod that goes underneath the machine arm should have the leaders attached so they lay flat on the machine bed and then go up behind the roller, because that is the direction in which you will roll the quilt. If you look at the picture on the website, it does show which way each roller moves; if you follow that when you attach the leaders, you should be fine.