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Measure and cut one-inch-wide notches 12 inches apart in the cedar 2x4s. Use a radial arm saw with a dado bit to make the wide cuts. Notch four extra 2x4s to use when assembling the trellis. Always wear safety glasses and use caution when working with a power saw or any power tool.
Measure and set the blade on a table saw to one inch and rip the notched boards lengthwise to one inch wide. This will yield three thin, notched boards for every 2x4. Notching the boards before ripping them to size helps prevent splitting.
Re-set the table saw to 1/2 inch and remove 1/2 inch from the back of each thin, notched board.
Fit the notched boards together into a grid and attach using a brad nailer. Always wear eye protection and use caution when working with a nailer or nail gun. These powerful tools can drive a nail through wood — or a hand or foot — instantly.