Systems designed to be used with a drill will tend to not utilize threaded connections as these can back off if the drill is run in reverse. A system such as the Rovac ButtonLok system is ideal if a drill is being used, as the rods lock together with a spring loaded button style connector that cannot back off if the drill is run in reverse. The rods are available in various lengths as seen here
. The drill adapter for the rods can be viewed here
. For cleaning a prefabricated system, I would suggest the use of only the polypropylene brushes as they will not damage the inner stainless steel wall of the chimney system.