To attach the decking boards, start at the back of the bench seat with the first board. There will be some overhang of the board at each end, over the legs and a little at the front. Make sure the board is straight against the back. Mark the position of the screws, two for each decking board, pre drill with the 3mm drill bit and countersink. Use the 50mm decking screws to attach the decking to the frame.