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Replacement Double Glazing Window Handles It is essential to replace a damaged double-glazed window handle in order to ensure safety and functionality. uPVC handles work on a spindle which runs through the middle of the handle and into the lock mechanism of the window frame. You will have to be aware of the step height for your uPVC handle which can be found by searching for screw cover caps on the inside of the handle. Tilt Turn Tilt and turn windows are a popular option in Europe howeve