Roborock H7M1A Manual Del Usuario página 26

Maintenance
3. Clean and wash the roller.
4. Place the roller vertically and leave it to dry for at least 24 hours.
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5. When the roller is thoroughly dry, reinstall it.
6. Hold the brush so the locking mechanism faces you. Place the
roller in position, then turn the lock clockwise to lock it in place.
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Roller Lock