Turn the lock pin on the top of the nozzle to align it with the "L" on the nozzle's top. Insert a coin into the screw and turn it counterclockwise. Lift the nozzle.
Lift out the basket screen and flush it with water to clean it.
Rinse out the nozzle with water to clean anything stuck in one of the holes.
Place the basket screen back into the sprinkler head. Pull the lock pin and place the nozzle on top of it. Turn the screw clockwise with the coin. Turn the "L" to the slot and push the lock pin down.