When you’re assembling the framework remember that the tapered sides on the front and back legs face each other. First, select and mark out the position for two evenly spaced pilot holes on each leg face. Use a 5mm bit to pre-drill and countersink as a clearance hole. Then drill clearance holes right through the countersink hole with a 6.5mm bit for the batten screw. You’ll need to fix the leg into the sides too. So in the centre of these two holes, and on the opposite side of the taper, use the 5mm pre-drill and countersink bit to pre-drill a clearance hole for the screws. Then drill clearance holes right through the countersink hole with a 6.5mm bit for the batten screw. Once you’ve pre-drilled the clearance holes, use the 5mm bit to pre-drill pilot holes. Position the sub-frame and then assemble the legs, back, front and sides around it. Glue and then fix with two 85mm batten screws on the face of the leg.
So the timber sides don’t split, and before fixing the legs into place with the larger 125mm batten screw, pre-drill, right through the previous countersink hole, using a 6.5 mm bit. Once you have a mark on the timber, use a 5mm bit to pre-drill the pilot hole. Glue and fix a 125mm batten screw into the face of the leg and into the outer frame. Repeat this screwing and drilling process for the other chair and the ottoman.