Screws are necessary for many weapon mods in Fallout 4. View this guide if you need to stock up on them.
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Fallout 4: Where to get oil

Oil is essential for crafting certain items in Fallout 4. This guide will show you where to find some.
Keep your Baldur's Gate 3s, I'm playing GoldenLand. Or Heath. Whatever it is, I'm playing it.