Apple slides one “point” spare parts in the box with the first generation Pencil, but don’t bother giving any with the second generation. This begs the question: how do you know a mine is worn out? How to replace it? Do you absolutely have to use the (expensive) Apple tips? Can replacement cords affect how the pen slides across the screen?
A mine in the lead
If you don’t use your pencil much, you won’t notice any signs of lead wear for two or three years. More regular users will likely need to replace it every six to twelve months, and professional illustrators have been known to use a batch of four replacement nibs per year! In any case, don’t wait until you’ve removed the plastic down to the metal “ball” to replace the wire.