I recently bought a Samsung R7040 PowerBot Cyclone Force Robot Vacuum Cleaner (Refurbished). The brush was very noisy when working and sounded awkward. After some research there was a suggestion/video on Youtube that the coax (f-boot) could be cut to fit the end of the brush to solve vibration issues during brush rotation. I'm glad I bought and tried them because it was so much cheaper than buying a new brush!
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