On a door built around 1971, the complaint is rarely subtle. Owners call us because the door is heavy enough that a weakened spring shows up as a door that won't budge past knee height, or one that slams the last two feet on the way down because the spring gave out and isn't carrying its share anymore. Extension springs from that generation, mounted along the horizontal track, fray and snap one strand at a time, so you'll often hear a loud bang in the garage weeks before the door actually fails. Wood panels that have taken forty-plus years of Connecticut winters also swell and bind in their tracks, which reads to most owners as 'the opener is dying' when it's really the door dragging against hardware that's slightly out of square from decades of seasonal movement.