Flatter

[Philip Davies]

Confused, thinking a flatter was made to be hit by another 'smith, while the primary moved it around part being shaped, or is that a different tool?

Yes, that’s correct. It is basically a finishing tool, to remove, hopefully, the hammer marks (although I like those!) if the piece is held steady on the anvil with a holdfast, one hand holds the flatter, or set-hammer, or fuller, or swage, and the other hand holds the hammer.