Mark the handle placement on one end of the 1x12x36-inch boards, making sure it's spaced far enough apart for the nipple of the handle to slip through at both ends of boards. We placed our holes two inches in from each corner. Use the handle you built in the last step to check your measurements. This will be the template used to drill holes through all of the boards. Repeat on the opposite end of the board.
Use masking tape to secure the three 1x12x36-inch boards together. Attach and tighten clamps to steady the boards to the table while drilling. Then, drill through all three boards at the marked holes using the 1-1/8-inch drill bit drill bit. Remove tape once all holes are drilled.