It Is Helpful For The Old Or People With Low Vision, Arthritis Or Hand Tremors, Or Any One Who Do Not Have Patient To Thread The Needle. Hang the wire in the lead slot (with crochet). How to use it :Insert the needle into the lead hole After releasing the pressure plate to return to the position, pull the needle (when the curve is pressed, push the pressure plate) Push the platen to the end and thread the lead through the pinhole