Haunted Bolt

The magician tells his audience about a recent visit to an old Victorian house that is believed to be haunted. He shows his audience a souvenir from this house - a large brass bolt with a screwed on nut. He places it on a table and covers it with a silk. When the silk is removed, the nut lies mysteriously unthreaded from the bolt! You get one ungimmicked bolt and one identical gimmicked version. Both are made of heavy polished brass and are a very visible - 3 3/4" - long.