Using the needle threader on my Bernina 440 QE did take a bit of time to get used to. You MUST make sure to press the needle up/down button to make sure the needle is in the right(all the way up) postion to thread or you will break your threader. Then my LQS owner taught us to push down on the left hand finger tab, make the number 4 with the thread from the post and passed the needle and the threader will do it's thing. Make sure you have good support from your shop to learn how to use your new machine.