The Anglers Image® Magnetic Fly Threader is an incredibly simple tool that works extremely well. For fishermen who fish in low light conditions or don’t see as well as they used to, it is indispensable.
How to use
Step 1: Insert the eye of the hook downwards in the notch. It will be held in place by a built in magnet.
Step 2: Insert the line into the groove. Feed the line down the groove and through the eye of the hook.
Step 3: Pull the threaded hook off the magnet, and tie with your favorite knot to secure it to your line.
That is all there is to it. The only thing easier would be to have someone else thread it for you.