I thought this was interesting and figured I'd share it. One of my MHS demo sabers has a slide switch for the on/off. When I replaced the existing pommel with a number 1 MPS with a Luke ROTJ FX pommel slid over it, I noticed that the triangular D-ring happened to line up perfectly with the on/off switch, acting as a sort of safety when the saber is off.
Here's a short video showing it in action:
Video
Corbin
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