The Times Record HARPSWELL — The Mitchell Field Water Tower has been thrown yet another lifeline, with advocates circumventing the board of selectmen to call a town meeting for a second vote on whether to demolish it. When offered the choice at the March town meeting of demolishing the unused tower or signing an agreement with an outside group to oversee its repair and reuse, Harpswell residents voted to send the tower to the scrap heap. But a group of Harpswell residents calling themselves the Friends of Mitchell Field claim that decision was based on misinformation and have worked since then to force another vote. In April, the group submitted to the town 351 valid signatures – more than required by law – calling for another vote.