A blade plug is a decorative accessory for those who wish to obstruct the emitter of their lightsaber for display purposes.
The plug comes in 2 different diameters : 1" or 7/8". Choose according to your saber's blade diameter.
The blade plug also allows some light to shine through when the saber is turned on. This is possible with Baselit and current Neopixels with lead beads on the pogo pin connector. If your Neopixel doesn't have those LEDs then the blade plug will not diffuse light.
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