In case the crofters interested in any common grazing shall at any time fail to appoint a committee, the Crofters Commission may . . . F1 after making such inquiry, if any, as the Commission may deem necessary, appoint a committee who shall have the same duties and powers, and remain in office for the same period, as if they had been appointed by the crofters, and in the event of such committee failing to make regulations within three months after their appointment, the Crofters Commission may make such regulations themselves . . . F1