Amendments to these bylaws may be proposed by the ExComm or by a written petition signed by twenty (20) members of the local group and received by any member of the ExComm. Such proposals shall be submitted first to the AMC for its approval to ballot. After approval to ballot has been received, the proposed amendment(s) shall be published in the next issue of the newsletter. A mail ballot shall appear in the issue of the newsletter that follows publication of the proposal and shall be sent to every member of the local group. The balloting deadline shall be no less than 90 days following the first publication of the proposed amendment(s) in the newsletter. To become effective, an amendment to these bylaws shall require an affirmative vote of a majority of those casting valid ballots, as well as final approval of the AMC and filing of revised bylaws with the Bylaws Committee. The Bylaws Committee will tell the local group the effective date of the bylaws as amended.