Professor Huyang's technical manual

Professor Huyang's technical manual was a book authored by the Professor Huyang, an droid architect who was in service to the Jedi Order, and it comprised a minimum of five separate volumes. Within a Jedi text belonging to Luke Skywalker, a Jedi undergoing training, there was a notation advising consultation of the fifth volume for more detailed guidance during the building of a lightsaber; this was after Skywalker wished to obtain a fresh kyber crystal following the shattering of his existing crystal when his lightsaber was destroyed by a Killdroid. Furthermore, the fifth volume provided blueprints for battle sabers.