Yep One screw worked fine, 2 different mountings, as they where 20mm thick one was mounted on a brick wall using a Rawl plug and a 60mm screw, the other was mounted on a kitchen unit side wall and only 18mm thick vinyl covered particle board with a 30mm screw. As the pulling action of the bottle opener is approx 50/50 % in a downward / inward motion they seem to be holding up… especially after New Year celebrations ! Also the bottle opener is only held in with small 12mm screws.