We check the track alignment first, before we touch a single roller - there's no point putting new hardware into a track that's already pulling out of square. If the track's sound, we pull the old rollers, check the stems and brackets for wear, and set new rollers matched to the stem size your door actually has, not a generic size that happens to fit loosely. If the track has shifted, we re-set it to plumb before the new rollers go in, so the wear pattern doesn't repeat in a year. We travel out from Eau Claire for this, about 8 miles each way, so we schedule roller jobs with a quick phone check first - if it sounds like a bent track or a spring issue layered on top, we bring the right parts the first trip instead of guessing.