Cut 3 pieces of duct tape 4 1/2-inches long. Lay them sticky side up on your work surface. Grab one of your 4" x 1 1/2" rectangles and lay it on top of one of the piece of tape. Line up one of the long edges of the rectangle with one of the long edges of the piece of tape, centering it between the two cut edges. Repeat this for the other two rectangles.