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Double Glazing Lock Repair Double-glazed windows are a favorite among homeowners who wish to increase the efficiency of their energy and security in their home. Windows are susceptible to being damaged or deteriorated over time. Fortunately, many problems with double glazing can be fixed without replacing the window unit. Stiff handles and locks, sagging windows, or misting are usually resolved by lubricating the mechanism or tightening screws. Locks damaged or worn out If a lock is damaged or worn out,