It is attached with mortise and tenon joints and strengthened with oak pegs. The corners are assembled with mortise and tenon. The tenon is cut to fit the mortise hole exactly. Mortise and tenon joints are attested from the earliest Predynastic period. A mortise is a cavity cut into a timber to receive a tenon. There are no mortise and tenon fastenings, and no sewing. One of the most important indigenous woodworking techniques was the fixed mortise and tenon joint. In its most basic form, a mortise and tenon joint is both simple and strong. Traditionally, rather than nails, mortis and tenon joints and wooden pegs are used. Early models had a smaller neck joint with a longer tenon. Usually the tenon is taller than it is wide. The administration was handled by Tom Maclennan and Kenny Craig of Tenon Recovery. Tenon puma and human heads stud the upper terraces.