Late-80s extension spring systems
A house built in the late 1980s usually came with an extension-spring setup or an early torsion system on a steel track, often paired with a chain-drive opener from the same era. By the time you get into 1990s construction, you start seeing galvanized torsion springs mounted on a center bracket, which fail differently than the side-mounted hardware common in older stock elsewhere in the service area.
