My sister got a good hint which I follow. Thread from the bottom up and I even pull the thread out of the needles till I get the loopers threaded. It seems that the thread from the needles gets involved with the loopers in a bad way if they are threaded when you turn the wheel to thread the loopers. I usually tie the new colors with a good small knot) to the looper threads as I take off the old colors on top. They pull the thread thru the path. The left looper is difficult, but I have a tweezers to insert the thread into the looper bar that moves over the right looper. I do a lot of sewing on knits and garments and find the serger very useful.