Dont think they work that way, movie was a fake i think it would be hard to make power conduct work that way and split energy, however it would be cool if you could make the weapon into a 2handed sword like in JK3.
This should be possible to move the crystals energy from one place to another, would also allow more honor fighting, if you face alot you have both blade side active, if fighting one you could put blade down to one blade, allowing a fair fight.
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For information: Double sabers are two sabers, fixed in the middle!
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My point is within lightsaber you have some crystals and a powerconduct to which on and off, the saber, if you divide weapon by splitting it in 2 you need a power conduct in both blade ends, and even then it would be weaker than a normal single lightsaber since you have to split the crystals inside since you cant have the same 2 crystals in both seperated blade ends.
If you turned a Doublebladed into a single blade like JK3 that would be possible to move the energy direction, but splitting it would divide the crystals within between the 2 blades and make effect less than 2 saber wield.
But if you wanna go dual wield why not just take 2 saber instead of splitting Dual bladed into 2 sabers.
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I have to explain it again: In fact double sabers are two different sabers. Two crystals and two energy origins. But to have a specially saber weapon, some guy had the idea to fix two sabers.