| I wouldn't suggest screwing anything that is going to take any kind of weight into the bottom of a piece of particle board.  Gluing isn't going to do much either... particle board is very prone to splitting/seperating.  Is there any way that you could attach a 1/2 inch thin board across the underside of the desk, lengthwise, and attach it to the metal framework of the desk?  Put a few screws through the board into the particle board as well, so it doesn't sag.  Then attach the tray to that piece... |