Torsion springs giving out
With most homes built well into the 1980s, we're replacing factory steel torsion springs that are finally giving out after three or four decades, swapping chain-drive openers for belt or screw-drive units, and dealing with the plastic idler pulleys and nylon rollers that were standard on doors from that build era - parts that wear out quietly until a door starts grinding or hangs crooked on one side.
