T-6 Diodem
this device, produced on the planet Arda-2, was used in starfighter targetting controls to establish a positive lock on a target. The natives of Arda-2 produced them for use by the Alliance, but they also produced a non-military version for certain household service devices. Mag Doum secretly recovered used home-service diodems and sold them to the Empire at significant markups. The Empire then installed them in TIE Fighters, and used them to attack Alliance starships. Luke Skywalker went to Arda-2 to protest what the Alliance saw as a direct sale of the T-6 to the Empire, and uncovered Mag Doum's plot.