Roborock H6 CE - Manual (Page 26)

Cleaning the Carpet Brush
Maintenance
3. Take the End Cap off the roller and remove any fibers
wrapped around either part.
5. Reinstall the roller, as shown.
6. Hold the brush, so the locking mechanism faces you.
Place the roller in position then use a coin to turn the lock
counterclockwise and lock it in place.
4. After cleaning, reinstall the end cap.
Roller End Cap
22