Sometimes the top-glass plastic can pop-up if it is moved from its fixed position. Simply push the plastic tabs on top of the top-glass back outwards and this will secure the top-glass into the metal frame and prevent it from popping up.
Sometimes the top-glass plastic can pop-up if it is moved from its fixed position. Simply push the plastic tabs on top of the top-glass back outwards and this will secure the top-glass into the metal frame and prevent it from popping up.