1. Turn the plastic ring counter clockwise a full turn to release.
2. Lift the top of the casing through the unlocked notch to separate. Clean as necessary.
3. To reassemble, make sure that the black tabs on either side of the turbine are seated correctly. The rounded top should face up; the flat bottom should fit into a groove on either side.
4. Next, loop the belt around the pulley on the turbine and on the brush.
5. Replace the casing and twist the ring back around to lock.