swivel

The patter of feet, and clatter of strap and swivel, seemed to swell into a bewildering din, but they were almost upon the fielato offices, where the carretera entered the town, before a rifle flashed.

[The settlement] was entirely surrounded by a broad unfordable marsh or swamp, which prevented all communication, except by private paths under water, known only to the rebels, and before which Baron had placed loaded swivels […]

Bob ain't got no swivel.