Contractors working on the Olympic Stadium in Athens were this week finally expecting to position the western arch of the stadium roof. The roof comprises two steel arches, prefabricated 70m away from their final position, and jacked into place as completed sections. Work finally got under way on the western arch on Monday and was expected to be complete yesterday (Wednesday). Steel contractor Cimolai said that the second arch should be slid into place in two weeks. Main contractor is Aktor, architect and engineer is Calatrava.