Requirements:
A jedi and R2-Q5 or R2-D2
Must complete jaba's palace and sarlacc pit.

The Hint:
1. Go to free play on sarlacc pit
2. Choose R2-Q5 or R2-D2
3. Make sure you have a jedi with you.
4. Kill everyone on the main ship.
5. Switch into R2-D2 or R2-Q5
6. Use the gun in the middle of the main ship with either R2(it should disappear)
7. Shoot the gun again with "B" before moving (it should hit the railing on the right)
8. Hit "A", then press select until you get to your jedi
9. Make sure you are parallel with the gun that you destroyed, where you see the picture of luke's head facing towards the picture.
10. Press "R" (he should walk to the railing, and disappear into the wall)
11. Try moving around, and keep pressing buttons until he jumps back onto the ground.

That is it! Now you have an awesome lightsaber!
*Note: If you do not want the lightsaber, press select to change it back.