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Replacement Double Glazing Window Handles It is important to replace a damaged double-glazed window handle to ensure safety and efficiency. uPVC handles are controlled by a spindle that is inserted through the middle of the handle to the lock mechanism inside the window frame. The height of the step on a uPVC handle is determined by examining the screw cap caps that are located on the inside of the handle. Tilt Turn In Europe, tilt and turn windows have been a common choice. However, they are only no