When the Mayor has disapproved an Ordinance or Resolution or item of it as herein provided, Council may reconsider and override the Mayor's disapproval within thirty (30) days after the Mayor files the notice of disapproval with the Clerk. If upon such reconsideration the Ordinance, Resolution or item is passed by two-thirds of the members of Council, it shall then take effect notwithstanding the disapproval of the Mayor. If the Ordinance, Resolution or item is amended on such reconsideration, it shall again be presented to the Mayor as provided in Article III, Section 8.