Calculate the Space Between the Taps
Use a tape measure to determine the rough distance between each tap on your mounting board. Factor in an extra inch on either side of the board for the brackets.
Mark the Board For a Shelf
Trace a line on the board where its top shelf will sit to figure out how high to position the supporting brackets on either end.
Position the Brackets
Position the brackets 1 inch in from the ends of the mounting board, with their tops just below the pencil line. Mark where the brackets’ fasteners will go.
Screw the Brackets On
Drill pilot holes for the fasteners and secure the brackets to the board.
Mark the Tap Positions
Draw a horizontal line across the center of the mounting board using the straightedge of a combination square. Then mark evenly spaced vertical lines through the horizontal one to indicate where each tap will go.
Attach the Spindles
Place the dummy spindles on the marks and drill pilot holes for their fasteners. Secure the spindles to the board.
Glue the Escutcheons On
Mix a two-part, fast-drying epoxy formulated for bonding metal. Spread the epoxy on the rims of the porcelain escutcheons and place them over the spindles.
Set the Taps
Fill the metal fittings at the base of each tap with epoxy and fit them on top of the spindles. Wait 5 minutes for the epoxy to set. (It takes 1 hour for it to fully cure.)
Attach the Shelf Top
Rest the shelf top on the brackets. To secure it in place, drive trim-head screws through the shelf and into the top ledge of the supporting board. Now pick a nice spot in the bathroom for your new towel rack.