electric guitar (Arddleen SY22)

3/4-size electric guitar, 1 bridge pickup, 1 volume knob. In order to keep the tuning knobs in the head from moving there's a screw which holds it in place; on this, for the thickest (6th) string the screw head has sheared off so the knob will swivel in its slot and doesn't stay in tune. The screw is stuck in the head and needs a really tiny extractor to remove. The knob itself and string are both fine and could probably be reused, and electrically it's fine. Just the guitar, no accessories