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While your Door Header is still on the Saw-Horses, it is the best time to also Install the Projection-Mount Brush Assembly.
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The Brush Assembly Installs on the Underside of the Back Piece of Header Rail, with the Brush facing the Opening.
 
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Count the Number of Holes that are Pre-Drilled into the Brush Assembly's Retainer.
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This is how many 1/4-20 Fasteners you will need to use to Install the Brush Assembly.
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Slide the 1/4-20 Square Nuts into the Channel on the Underside of the Rear Header Rail.
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Make sure each Square Nut lines up with a Pre-Drilled Hole in the Brush Retainer.
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NOTE: Header Bracket Omitted for Clarity.
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Place the 1/4" Flat Washers onto the 1/4-20 Screws, and Fasten them Through the Brush Retainer, into the Square Nuts.
 
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                                          Almost done!                  
                  
                                          Finish Line