New and old end-assemblies
The ends of the vine rows are called end-assemblies. Those on the right hand side of this picture are the old ones. How they are constructed can be the difference between a tidy, firm & neat row and one that sags and shades itself. Apart from the weight of the vines the wind is a major strain on the trellising. At one time the wind blew so hard that the intermediate poles snapped and pulled the end-assembly poles out of the ground. The whole row lay on the ground undamaged but able to flip-flop from side to side.