Fevikwik can repair this with ease. Wipe the broken edges with a soft, clean cloth to remove any dust, hair or debris. Use a few drops of Fevikwik along the broken edge and press it back into place. Hold in place until the pieces stick together, and gentle remove the pressure of your fingers. Since an exact fit is essential, make sure the pieces are well aligned before the glue sets. Let the glue dry for at least 4-6 hours.