Acquire a vintage camera flash handle that's around 8-inches in length. Strip off the reflector dish, bulb holder and any other parts you don't want included on your lightsaber prop. If it's not integral to the flash battery pack, be sure to retain the central clamp used to fix the handle to the camera.
Clean and polish the flash handle before adding any additional parts, being sure to remove any batteries still inside.
Cut the windshield wiper blades into short pieces of around 3-inches each. Heat glue six of them vertically, at even intervals, around the bottom of the handle to create the grip.
Cut a rectangular piece of circuit board to the right dimensions to fit inside the closed clamp. Although it doesn't move, the clamp is used to represent the switch that turns the lightsaber on and off.
Cut strips of aluminum tape to cover any manufacturer's etchings or embossing on the flash handle, and stick it over the markings.