The "trunnel" at Circle and Constitution is no different.    From Wordnik.com.  [Gazette.com :] Reference

Into each of these we graved a piece of plank, and in one of them we drove a trunnel where none had been before.    From Wordnik.com.  [A General History and Collection of Voyages and Travels — Volume 09 Arranged in Systematic Order: Forming a Complete History of the Origin and Progress of Navigation, Discovery, and Commerce, by Sea and Land, from the Earliest Ages to the Present Time] Reference

Den hit's creep into yo 'trunnel baid.    From Wordnik.com.  [The Complete Poems of Paul Laurence Dunbar] Reference