I'll be interested to see what you work out. I was surprised to learn that there were steel mills for grinding corn in the early days. I wonder how similar they were to your corona mill.
THE SOUTH CAROLINA GAZETTE
August 28, 1736
JUST IMPORTED in the Ship Anna Maria,.... crates & hogsheads of earthen ware,
indian corn mills, extraordinary good oval ey'd indian hatchets,
The South-Carolina Gazette
December 10, 1750
CHARLES-TOWN
”¦.grind stones of various sizes, and
quern stones of different dimensions, also
steel corn mills, a small assortment of family medicines,
THE VIRGINIA GAZETTE
September 19, 1766
...grindstones,
hand millstones, most sorts of pewter
THE SOUTH CAROLINA GAZETTE
September 25, 1736
THIS DAY IMPORTED...white cotton caps,
quern stones, bohea tea,
The South-Carolina Gazette
June 10, 1751
”¦.grind stones, and
quern stones for grinding Indian corn.
The quern mill was an interesting machine, used by frontier families until a regular water-powered stone mill became available. Here's one from Frontier Living, by Edwin Tunis. Excellent book, by the way, as are his Colonial Living and Colonial Craftsmen.
Spence