HARPSWELL — In a ditch, half-hidden in weeds, is a remnant of the storm Mainers won’t soon forget. It’s a cut-up utility pole, one of hundreds that were destroyed in the October 2017 wind and rain storm that left a record 470,000 customers in the dark. “That pole snapped, broke in two,” said Gordon Weil, who lives at the end of a narrow, woodsy lane and gets electrical service via the pole.