Need help to identify some prop parts

Mods, if this post if not in the right place, please move accordingly.

I'm sorting out my stuff to put them up for sale, and came across these parts in one envelope. They seem to belong together judging from the way they were packed, but I can't remember what I bought them for.



I'm guessing it's for a Luke ROTJ Hero saber blank I have in my collection, but I don't understand why there are two control boxes, and what the two different types of sets screws(2 each) are for. I also have no clue what's that slim silver bar is for.

Would greatly appreciate it if someone could enlighten me...

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