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Replacement Double Glazing Window Handles It is important to replace a broken double-glazed window handle in order to ensure safety and function. uPVC handles are operated by a spindle which runs through the middle of the handle to the lock mechanism in the window frame. The step height of a uPVC handle is determined by examining the screw cover caps on the inside of the handle. Tilt Turn Tilt and turn windows are a popular choice in Europe but they've only recently made an impact here in the UK. The a