Abstract: A brush assembly for cleaning the bore of a cannon. The assembly includes a cylindrically-shaped brush (46) supported on front and rear plates (22, 24). An assembly shaft (30) extends through the plate, the center of the brush and through the rear plate. A threaded collar (36) is connected to the rear of the assembly shaft for receiving a ramming shaft (42). A conically-shaped centering element (58) is disposed over the threaded collar and is provided with an opening for accommodating the ramming shaft. The centering element realigns the brush with the bore thereby permitting the brush assembly to be pulled back through the barrel (72) without the necessity of manually recentering the assembly with the bore.