I may as well open these items up to a wider audience - found underground but close to surface, in a mostly natural chamber clearly used more for ore-processing than actual mining, with two possible blocked connections to lower levels. They're made of wrought iron, and the central point is sharp, as though intended to be hammered into wood, but the end points are bent. The most convincing explanation was that they were stops on a windlass driving a rag-and-chain pump, and there is a flooded choked pit in the floor of the chamber, but that's hardy guaranteed proof.
Any ideas?
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