I have the Juki 2010Q, and find the needle threader to work well provided you do it correctly. Granted, It is not as full proof as other computerized machines, but it does work. As others have mentioned, use your UP/Down button to raise the needle to the right height. Second, after you loop the thread around that back hook and then up in front of the needle, make sure you get your thread in that little plastic groove in front of the needle mechanism, and gently pull thread to the right of it and then back around the right side of the needle. It is like making a U turn from where you first inserted the thread into the hook in
back. You gently release the button, and wallah it is threaded.
Once you know the idiosyncrasies of how to do it, you will get it at least 80-90% of the time. I wish I could draw a picture for you. If you understand what I'm saying, try it, and let me know if it worked for you.
Here is a much better video that will show you how it is done. She shows the needle threading after she shows how to thread the machine. You can click on the Settings symbol on the bottom of the YouTube screen and change the speed down from Normal to either. 50 or 75. This helps see better. Watch it several times. Notice how she holds and positions the tread.
https://www.youtube.com/watch?v=X6D5...arlingMushroom