For a spring replacement, the first step is confirming the door's actual weight and the drum size on the shaft, not just swapping in whatever was there before - that's how the mismatch gets corrected instead of repeated. We release tension, pull the old spring, check the cables and drums for wear while the shaft is already exposed, and install the correct spring for the door as it exists today. If the door's been retrofitted with a heavier panel at some point, that's usually where the extra ten minutes goes, since the shaft and drums sometimes need resizing too. Opener work follows a similar logic: before replacing a gear or a motor, we check whether the opener is fighting a door that isn't balanced correctly, because a new opener on a bad spring just fails again, faster.