Be it further enacted, that the city manager, by and with the consent of the City Council, may sell the securities belonging to a sinking fund, or any part of them, at any time, when the proceeds thereof may be needed for the payment of bonds, on the best obtainable terms. (As amended by Priv. Acts 1972, ch. 416, sec. 12, Priv. Acts 1995, ch. 55, sec. 2, and Priv. Acts 2014, ch. 55, sec. 1)