Definitions for "Crooks"
Made from (6 - 10 mm) iron rod varying from 8" - 12" (200 300 mm) in length, pointed at one end, and with a forged right angle hook on the other to hold the sway. Driven into the rafters to secure the roof. See screw fix - now one of the most popular, a screw with stainless steel wire attached screws into rafter and wire twisted around the sway