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Replacement Double Glazing Window Handles It is crucial to replace a damaged double-glazed window handle in order to ensure safety and efficiency. uPVC handles operate on a spindle that runs through the centre of the handle and through the lock mechanism inside the window frame. The height of the step on 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 option in Europe but th