The stylus is controlled by the two large knobs, one of which moves it vertically and the other horizontally; turning both knobs simultaneously out and re-coat the inside surface of the screen with aluminium powder.
The stylus is controlled by the two large knobs, one of which moves it vertically and the other horizontally; turning both knobs simultaneously creates diagonal lines. Doing this causes polystyrene beads to smooth out and re-coat the inside surface of the screen with aluminium powder.