It consists of two thick trunks placed upright, their upper ends mortised into a horizontal log which projects beyond them at either side.
The platform itself was usually composed of rough layers of unbarked stems, but occasionally it was formed of boards split from larger stems. When the mud was too soft to afford foothold for the piles they were mortised into a framework of tree trunks placed horizontally on the bottom of the lake.
They were fixed by the butt in a socket of stag's horn, mortised into a handle of wood.
The remains of the stockade round the margin were of vertical piles mortised into horizontal bars, and secured by pegs in the mortised holes.
The eastern upright was mortised into position and had an external lateral brace to the base plate.