I have a 20 year old Simplicity brand serger (the name does NOT fit - not simple at all :( ). I have to thread the 3rd & 4th before the 1st & 2nd. When it's threaded correctly it works beautifully. When the thread breaks or I want to change color, I can never get it right. It has so few miles on it for that reason. I wish it was easier. They sell self threading ones...sure wish I could afford that one!