OAK RIDGE – For the first time in about two decades, the waterwheel of the Old Mill of Guilford on N.C. 68 is turning again. “Fingers crossed, we hope it happens,” said Darrell Klug, who owns the 18th century mill with his wife, Amy. On the morning of Saturday, May 11, they were joined by more than 25 supporters who waited anxiously to see whether water released from a pond and rushing through a long metal pipe would set in motion the red wheel of the Oak Ridge landmark.