First Sneak Peek at the Dioskouri Corinthian

[M. Demetrius]

Until you get back to land, think of a geologist's rock hammer. Now stretch the head part out six or seven inches, so it's long enough to strike against the inside of the bowl part of the helmet. That's more or less what the picture on the vase shows. Must have been difficult to use, but different striking surfaces, like ball peen, cross peen, etc. would produce different effects on the metal surface, and as Chrisian pointed out, different marks and patterns on the inner surface.