I have bought many used rapidograph and need the brush for cleaning. In addition to clean so that my existing rapidograph if I have a dried-cone again.
Sometimes I have to build the cone apart in order to brush the debris. But I've taken small interdental brushes. But not long enough to go into the cone inside. This brush gently rid of coarse impurities. You have to be a little cautious at the top, but that's not a problem or you tweaks from the metal tip. That works. Finally, you can still work over with the ultrasound device.
So I've got all my cone clean. They can also be wonderful for use in other small parts. I am glad that I have the brush and have not regretted the purchase.
