The guy on set who's in charge of props is the prop (or property) master. He may or may not have other people making the actual props. But I vote for going with Tommy's suggestion. Must quicker. Just be sure to get it in one take. Or hire more PAs.
Prop Master - Responsible for finding, organizing, tracking, supervising, budgeting everything to do with props, and generating tasking for Prop Makers
Hammer Stuck in Guy's Head - Not a job for a Prop Master or Prop Maker (a 'prop' is something handled by an actor; otherwise it's set dressing); this is a job for a Special Effects person. Or a Carpenter. Either way.