David JONES on Nostr: it's not round on the inside (you can't really tell from the pictures), it's more ...

it's not round on the inside (you can't really tell from the pictures), it's more conical. But your comment makes me wonder... as if it might receive a cylinder with a conical termination? Like, a piece of graphite or a charcoal stick? It doesn't look like it's designed to grind charcoal or similar, and it doesn't look like it ever has, but i might give it a go. (i think ink is usually ground on nearly flat ceramic dishes)