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-[* black] Insert wisdom here.
+[* black] Now that the grille has been removed, we can start tightening the screws on the impeller assembly, that is, the part that connects the blades to the fan's motor.
+[* black] Start by exposing the screws by turning the blades - there should be four.
+[* green] Check the tightness of every single screw by gently turning the screwdriver in a clock-wise fashion.
+[* green] Pick one screw and start by tightening it a certain amount, that is, just one twist!