Alignment rings are used to precisely align certain components of a lightsaber (e.g. the emitter).
They can also be used to align the two switch-on buttons of a double-bladed lightsaber. See more in this video:
Further tips and tutorials
This article compares the five best lightsaber retailers worldwide
This guide will help you find the ideal lightsaber for your purpose and budget.
This guide will help you make the right choice
Update your soundboard for new features and improvements
Personalize your lightsaber with your own Soundfont.
Operating aid for lightsabers without LED button (almost all premium & replica lightsabers)