Unless otherwise provided by charter, the supervisor, clerk and township treasurer shall constitute the board of township election commissioners for each township, 2 of whom shall be a quorum for the transaction of business. The township clerk shall act as chairman of the board. Should only 1 of said officers be in attendance on the day appointed for a meeting of the board, the officer in attendance shall appoint a qualified and registered elector of the township to act in the absentee's stead during the period of nonattendance.