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Double Glazing Locks Repair If a double-glazed window does not close, it causes drafts that allow heat to escape. It also reduces your security measures for your home and exposes you to burglary. Double glazed window seals, hinges, and handles can become damaged over time. If this is the case it could affect how your windows work and could invalidate any warranty you have. Faulty Locks Many people install anti-burglar devices on their main gates and doors however, they forget that windows are prime target