Although Jack Windmill is now devoid of machinery, evidence of such remains today.
The "beehive" cap, constructed of lapped ash, rotated on a circular curb and brought the Sweeps into wind by means of a Fan.
The five floors, from top to bottom, are the Gear floor, Bin floor, Stone floor, Spout floor and Ground floor, from which an underground passage leads to the Granary.
Restoration of Jack Windmill began in September 2012 with the construction, by volunteers from Sussex Mills Group, of a temporary roof.
In March 2013 the original cap was removed and the temporary roof was installed.
Further details of Jack Windmill's restoration are on the Sussex Mills Group website .