Steel bar

The metal bar can be obtained on the farm in the chapter A trip to the country after using it to Paulie try open the barn door. After prying open the bar, it will drop to the ground and we can pick it up and use it for threshing. Later in the story, in the chapter Bon appétit!, one of the three hooligans who run at us after killing the traitor Carlo in the courtyard has a metal pole.