I attached the rope by tying a few knots and driving a 1 5/8" decks screw thru it . I put 4 screws in the top and 2 in the bottom keeping the 1 closest to the edge tight to it so it doesn't lift up on the mattress. Make sure you screw into the bunk frame. On the 28bhs I couldn't find any other way that the bottom bunk could lift up to get in the storage under and you open the bathroom door.