Here are the directions to get a double-bladed saber in multiplayer: 1) Start your own server. 2) Pull down console, type in "devmap mapname" [mapname is the name of any map, ffa_deathstar for example]. 3) Take out saber, and deactivate it by hitting 1 again. 4) In console, type /THE DESTROYER or \THEDESTROYER [one of them will work] 5) reactivate saber NOTE: This will not work in single player. Both blades can hurt enemies and make marks on walls. The animations are the same for the single-bladed saber, so it looks like you slice yourself a lot. Here are some screenshots of this action: here, here, here, here, and here.
 
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"Out of the night that covers me, Black as the Pit from pole to pole,  
I thank whatever gods may be For my unconquerable soul.
In the fell clutch of circumstance I have not winced nor cried aloud.  
Under the bludgeonings of chance, My head is bloody, but unbowed.
It matters not how strait the gate, How charged with punishments the scroll,
I am the master of my fate: I am the captain of my soul."
--- William Ernest Henley (1849 – 1903)