Rare 1938 Air Ministry Heavy Weight Pulley Wheel

A large 1938 dated Air Ministry twin wheeled pulley being the type possibly used for the installation & removal of heavy aero engines ( overall length 18 inches). The pulley without any packaging weighs in at 8.5 Kg so please contact me regarding carriage costs or possible collection. The cap is not included in the sale, used for size comparison only. Sorry UK sale only.