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Replacement Double Glazing Window Handles When a double-glazed window handle breaks, it is important to get a replacement to ensure safety and function. uPVC handles are operated by a spinning wheel that is inserted through the middle of the handle and into the lock mechanism in the window frame. The height of the step on a uPVC handle can be identified by looking at the screw cover caps on the inside of the handle. Tilt Turn Tilt and turn windows are a c