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Replacement Double Glazing Window Handles If a double-glazed window handle breaks it is essential to replace it to ensure safety and function. uPVC handles are controlled by a spindle that runs through the middle of the handle and into the lock mechanism inside the window frame. The height of the step on a uPVC handle is determined by examining the screw cover caps located on the inside of the handle. Tilt Turn In Europe tilt and turn windows have been an increasingly popular choice. However they a