1. To press the ceiling panel to the holder of the hatch, to turn edge of the ceiling panel and to insert it into a groove between the holder and the aperture amplifier on all perimetre. |
2. A fringing of an aperture of the hatch. Since the middle of the back party of an aperture to establish a fringing on the amplifier and to fix by means of easy blows of a hammer with rubber brisk along all perimetre of an aperture. |
3. The holder of a latch on the ceiling panel to screw 2 screws. |
4. The glass panel on a hatch framework. |