Membership and quorum of board for admission of electors.

(b) Any member of the board for the admission of electors in any town who finds that he is unable to attend a meeting of the board shall designate another elected officer of such town to act for him by filing a statement of such designation in writing in the office of the town clerk at any time prior to the opening of the meeting, provided, if an assistant town clerk is available, he shall serve in the absence or inability of the town clerk and, if the deputy registrar of voters is available, he shall serve in the absence or inability of his registrar. (c) A quorum of the board for the admission of electors shall consist of a bare majority of the members of such board. An assistant town clerk or a deputy registrar or any other town officer designated by, and acting for, a member of such board pursuant to the provisions of subsection (b) of this section shall be included as a member of such board for purposes of ascertaining the existence of a quorum. (d) This section shall supersede any inconsistent provision of any charter or special act.