I have one of the little bird threaders and use it on all the machines I have. I have floaters in one eye so that little bird is very useful.
One trick that was taught to me at a HandiQuilter workshop to cut down on threading the needle - when changing threads, cut the thread near the spool, take off the spool, put new spool on spool holder, then tie the end of the new thread to the cut end of thread left in the machine with a simple knot, then from the needle, pull the thread away from you, pulling the new thread through all the loops, guides, tension disks - right through the eye of the needle. Voila, you are all threaded up and ready to go.