How to fill a Yard-O-Led pencil

Pull out the cap section (1)* and turn in an anti-clockwise direction until the slider (2) is completely unscrewed from the barrel (3).
Push the slider grip (4) along to expose the lead holder (5) and any remaining lead. To release any residual lead, hold the slider grip firmly between thumb and forefinger and push down towards the slider grip. The resulting spring action will release the lead.
* some Yard-O-Led pencils divide in the middle. In this case pull the two sections apart.

Unscrew the refill nut (6) and remove a spare lead ftom inside the barrel. Replace the refill nut.
Insert the new lead into the lead holder, ensuring it is pushed fully into place. (Failure to push the new lead right into the holder may cause it to move up and down when writing.)
Move the slider grip back along the slider towards the cap section, and insert the whole slider mechanism into the barrel.
Screw the cap section back over the refill nut, then turn the cap clockwise until lead appears at the tip of the pencil.