Weaponsmith Archive

I am a relative Newb who grinded my way up to Master Weaponsmith and am now in the process of making some good weapons.
I want to make some vibro weapons and have come across the need for a small component called a "Control Unit".
Thing is I can't find it anywhere! I can't find it in my weapons schematics or my general item schematics!

It's driving me crazy. Am I just missing it or is it somewhere else. Someone please help me out.

Thanks in advance.

it's craftable by master artisans

Thank you so much!!
I've got three friends who are Master Artisans, guess I had better get them working, lol.