The broken device is used in the Mourning's End Part I quest. It is given to the player by the Head Mourner in West Ardougne and the player must have it repaired by a gnome who is being held captive by the mourners. The gnome will repair the device, turning it into a fixed device, but only after the player has tickled his feet with feathers and given him some toad crunchies.
The broken device can be re-obtained from the chest in the Head Mourner's office. To get it fixed, you will need a tarnished key, a piece of leather, a magic log and some toad crunchies. The gnome will still repair it after Mourning's End Part I is complete, but it is impossible to do so after completing Plague's End.
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The device was broken by Nissyen Edern when he attempted to fire vials of dye at the sheep in an attempt to dye them after wasting his original ammunition.