Thr Video Recorder i have is quiet Old and the Producer could Not help me. So i w as very glad to find an offer for the owners Manual for a very fair Price.a I obtained the original Manual very quick and I am happy to have it now.
Text excerpt from page 15 (click to view)
Turn the screws clockwise to lift the front edge of the hood and use a spirit level to check the hood is positioned at right angles to the wall before fitting the security system. The wall brackets have two studs and when the cooker hood is hung onto the brackets the studs project trought the holes above the levelling screws. When the hood is level fit the two shake proof washers and nuts supplied to fully secure the cooker hood.