The ground floor of the mill is the meal floor . It is where the freshly ground flour is delivered for bagging up . The wooden great spur wheel , located at the bottom of the extended upright shaft and stone nuts are located on this floor . The great spur wheel has been converted from compass arm construction to clasp arm construction . A third pair of 4 feet 6 inches ( 1 @.@ 37 m ) diameter French Burr millstones is located on a hurst frame , driven by the auxiliary engine via a fast and loose pulley .