On both ands of the larger board and draw a line between both points then we ll set two screws along the line each four centimeters from the edge now we can attach the two long boards together in two shifts the. next will attach one of the smaller boards to the side one screw length is four centimeters this is the amount you need to insert from the edge attach four screws two to each connecting. finally we attach the other end to peace. and that s it so quick and simple and so versatile. ....