The threader on my Juki TL-18QVP only worked part of the time when I first got it. I got my magnifying glass out and discovered that the threader wasn't going through the eye of the needle each time. Tweeked it a little and it's worked great ever since.
Jim
PS: Forgot to mention that it's important to make sure that the thread is pulled properly into the threader before releasing it.
Last edited by Flyboy Jim; 07-17-2020 at 07:40 PM.