The electromagnetic actuators list is a paper note in Fallout 4.
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Given to the Sole Survivor by Proctor Ingram during the Liberty Reprimed quest, when asked to find a high-powered magnet.
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Here's what you need for one of Prime's Electromagnetic Actuators:
~ High-Powered Magnet x1
~ Screws x1
~ Fiber Optics x3
~ Circuitry x5
~ Rubber x5
~ Steel x10
I realize the High-Powered Magnet might be difficult to find, but Elder Maxson and I have confidence in your abilities. Good luck!
-- Proctor Ingram