For the door that's not broken — just wrong
Plenty of sliding doors don't need parts; they need a professional hour. The panel sits slightly tilted, so it scrapes at one end of its travel. The latch needs a lift-and-wiggle to catch. There's a whistle in a north wind and a bump halfway along the track. Apollo's alignment and tune-up service, from $109, is the systematic answer: we adjust roller height until the panel is dead plumb, dress and lubricate the track with dry PTFE (never grease, which binds with grit into grinding paste), re-time the lock keeper, and cycle the door until it moves with one finger.
