Crack ~upd~ Topwindowblinds74build320

| Cause | Symptoms | How It Leads to Cracks | |-------|----------|------------------------| | | Jerky lift, cord fraying | Excess tension pulls on the rail’s ends | | Impact or accidental bump | Visible hairline crack, “click” sound | Direct force concentrates stress at the rail’s weakest spot | | Temperature extremes | Cracks appear after hot summer or cold winter | Materials expand/contract, causing fatigue | | Age & UV exposure | Discoloration, brittleness | UV degrades polymer chains, reducing flexibility |

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