 The cap was a typical ogee shape and probably originally covered in iron plates.There were three pairs of millstones on the first floor, overdriven by a wooden upright shaft in wooden bearings.The stones could be disengaged by means of elm glut boxes (glut box timbers have a slot cut in them to allow the top of the quant (the vertical shaft) to be removed, enabling the stone nuts (pinions), and hence the millstone to be disengaged from the great spur wheel).