Chairs of this type were made with turned extensions to the bottom of the legs to pass through the rockers in a way which would reliably secure such a heavy chair. In fact, any Windsor design could be made as a rocker. Allsop & Son of Worksop, Nottinghamshire (fl.1871-1887) noted on the bottom of their trade card Rockers if Required 1/- extra. (Illustrated in Dr B Cotton The English Regional Chair Woodbridge, 1991, p.177, fig. NE269). The author also illustrates a similar rocking chair as fig. NE262 which has a stencil of Allsop & Son, Worksop, Notts under the seat