I have
this little gadget, which I use if ever the thread is too thick for my auto threader. Although mine isn't the Dritz one, it's the same. You place your thread across the gap in the tool and 'run' it down the back of the machine needle. A little pin pushed the thread through the eye of the needle - voilą! I think it works on the same principle as the ones for hand sewing needles.
It also doubles as a needle holder for when you change needles.
