Tying the rope
The ropes were tied to the round post using a round turn and three half hitches.
See below for explanations regarding the knots.
One rope was tied 100mm (4") in from the end of the post. The gap between the two ropes was 500mm (20").
Half hitches were also used to tie the ropes to the seat.
The ends of the rope needed 'whipping', which means that they needed to be bound with a whipping twine to stop the rope from fraying. See below.