On both ends 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 a t. shirt. 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 to to each connecting. finally we had searched the other end piece. and that s it so quick and simple and so versatile. ....