Reference Book: Star Wars Saga Edition Jedi Academy Training Manual
See also: Lightsaber Construction
This simple Lightsaber Modification is usually added only to Lightsabers whose wielders frequently Throw the Lightsaber as a ranged weapon. As a Swift Action, the wielder can lock the blade in place; when doing so, this prevents the Lightsaber from being accidentally deactivated when the weapon is jarred, such as during the impact of being Thrown. A Swift Action unlocks the blade, meaning that it takes two Swift Actions to deactivate a locked Lightsaber blade.