New 50" fiber Optic Capstan Wheel To conform to the many specifications of fiber optic cable available, and to offer more cable pulling capabilities. Condux offers several sizes of capstans that fit the Condux Fiber Optic Cable Puller. These bayonet style capstans are offered in 12" (305 mm), 30" (762 mm), 42" (1,067) and 50" (1,270 mm) diameters for a standard 27⁄16" diameter bayonet style shaft.Condux 08675220.