Here's a couple I think would fit:

Covertec: A luggage company that provided special belt clips for the lightsaber props used in the Prequel movies. The term also refers to the clips themselves, which function similarly to cell phone belt clips. This is a popular style of belt clip used by many saber enthusiasts.

D-Ring/ O-Ring: Metal rings attached to, or close to, the pommel of a lightsaber, used to hang the lightsaber from a belt hook. Used for the original Trilogy lightsaber props.

Crystal Chamber: In-story, the internal space of a lightsaber that houses a focusing crystal. In real life, some saber enthusiasts like to add a decorative crystal chamber, using plastic gems or actual crystals, often with an LED display.

And one I'd like to see clarified is "kill switch." I know those have something to do with custom soundboards like Crystal Focus and charging ports, but other than this passing knowledge, their purpose eludes me.

If anybody would like to elaborate upon my additions, please feel free.