Niles OS7.5 Installation & Operation Manual page 15

If you are using an applicator or brush and a can of paint, thin the paint first. Thick
paint will tend to clog the grille holes. To ensure a uniform appearance, paint the
front and back of the grille.
Replacing the Grille
After the grille dries, carefully fit the grille into its recess so that it is barely in place.
Starting with one corner, go around the loudspeaker, pushing the grille in a little bit
each time. You should be gentle; the aluminum grille can be bent easily out of
shape. You will feel a positive "snap" when it is in place.
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