Asymmetric fatigue progression
That's a torsion spring that's lost tension unevenly, or a track that's been quietly bending out of true for years. On a lot of Margate garages, nobody's touched the spring since the house was built. That matters here more than it might elsewhere, because Margate's housing stock centers on 1978, right in the middle of the broader 1965-2005 build window this whole region shares.
