Sagging gates — fixed at the post, not at the hinge
A gate that sags isn't a hinge problem nine times out of ten. It's a post that drifted out of plumb in planned-community grading over heavy Cass County clay. We diagnose by checking post plumb first; if the post moved, we pull it, dig the bell-bottom, and reset 36 inches in wet-poured concrete. Then the gate hangs square again, and stays that way.