a link member with wear crutch , the linking member including a pair of side arms and at least one integrally formed loop end portion , the inner surfaces of the side arms and loop end portion defining a friction surface , the inner surfaces of the respective side arms diverging from one another away from the loop end portion and the wear crutch including two curved surfaces arranged as an outer and an inner surface , the outer surface to abut a surface of the linking member in a loop end portion and the inner surface presenting a wear surface for the linking member , and whereby the outer and inner surfaces intersect one another at opposite ends of the wear crutch along common edge portions , and a pair of substantially parallel locating arms adapted to abut respective surfaces of the linking member such that said common edge portions each engage an adjacent arm in a substantially flush manner when the wear crutch is seated on the linking member .