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Replacement Double Glazing Window Handles It is essential to replace a damaged double-glazed window handle to ensure safety and function. uPVC handles are operated by a spinning wheel that runs through the middle of the handle to the lock mechanism within the window frame. The step height of a uPVC handle can be identified by looking at the screw cap caps that are located on the inside of the handle. Tilt Turn Tilt and turn windows are a common choice in Europe but they have only recently begun to make