Originally, millwrights were specialized carpenters who completely designed and constructed mills. Mills were made by millwrights, builders and iron founders. The mill was designed by Messrs Holman Brothers, the Canterbury, Kent millwrights. Proctor & Burton was established in 1840, operating as millwrights and engineers. Decker & Seville were millwrights who made equipment for flour milling. The windmill was built in 1813 by Messrs. Hill, the Ashford millwrights. The natural waterpower in these two gorges attracted entrepreneurs and millwrights throughout the 19th century. Repairs were done to the mill by Neve's, the Heathfield millwrights in 1937. It was rebuilt less than a year later with the assistance of Dutch millwrights. The work was done by millwrights John Lawn and John Bond. The work was done by R Thompson & Son, the Alford, Lincolnshire millwrights. The Todd family were millwrights, originally from Connecticut. Many millwrights choose to enter the private sector to work on a contractual basis. Often, these millwrights are paid a premium based on their years of field experience. Millwrights are frequently unionized, with estimated numbers of around 45% in the US.