Before threading your Brother serger, it’s important to follow these quick steps first. Many people complain that sergers can be difficult to thread, but as long as you do everything correctly, it will make an easier task for you:
Raise the telescoping thread tree to the highest position possible
Align the thread holders above the spool pins
Thread the holder on the thread tree
Thread the spool pin
And make sure it’s in the correct position.
Then, when you’re ready to finish threading, make sure you always thread in this order: upper looper, lower looper, right needle, left needle.