Smithy: Grindstone

Unlocked by	Steel Works
Build cost	Engineering Details ×2 Steel Detail ×4 Piece of stone ×1
Demolishing returns	Engineering Details ×2 Steel Detail ×4 Piece of stone ×1

The Smithy: Grindstone is an extension for the factory’s Smithy that no recipe uses. It costs 2 Engineering Details, 4 Steel Details and a Piece of stone, and comes with the technology Steel Works (175 red, 20 blue). The two recipes that technology brings, the Engineering Kit and the Supply: Steel Tools crate, need the Bellows instead.

Notes

Building it takes up the Smithy’s large spot, which the Hammer and Press need. Taking it down gives back everything.
Unconfirmed: it has no use. This follows from the game’s files and has not been checked in play.