How do you fit the fittings in the tray? I have checked out the following link http://www.overgrow.com/growfaq/1094 but i am still unable to do it. I have made one hole on the tray about an inch wide and the fittings feels lose. It feels like water may run between the tray and the reservoir. Any suggestions. Right now my hole is big enough for the top end and the i side the fitting in the hole and screw it with the bottom side of the fitting that fits into the reservoir. Except it wont screw tight. What should I do?