In star wars (return of the Jedi) specifically in the scene where Darth Vader examines Luke's lightsabre.....

Question

When Darth Vader examined Luke's new lightsabre, you could hear clicking sounds, what do you suppose made them. I couldn't see anything on the weapon which could be adjusted.

Answer 1

Probably it was just something behind the set that made the sounds. It also could have been the AT-ATs outside, someone coughing, stormtroopers walking, the camera man dropping his keys, the ventilation duct, or the metal lightsaber clip moving when Vader picked it up. There are so many possibilities, it is endless.

Answer 2

That was darthys macanicle hand adjusting.