On 7 Mar, 18:44, wrote:

I have a drill attachment for stirring paint, which is also very useful but
you have to be a bit careful with the drill speed and direction of rotation.

The version for cleaning rollers has to be the easiest thing in the
world to d-i-y: Just get a cheapo roller frame from the pound shop,
cut the steel rod, and secure the plugs against rotation.

How are brushes held in the cylinder of the paintbrush version?