Elastic nut is a locking device in which__________________?

A. through slots are made at top and a cotter-pin is passed through these and a hole in the bolt, and cotter pin splitted and bent in reverse direction at other end

B. none of the above

C. a slot is cut partly in middle of nut and then slot reduced by tightening a screw

D. hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is stewed on the bolt causing a tight grip

E. one small nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming

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