So, I picked up an optional lower tray for my Laserjet4. I attached it and tried to print, and the printer jammed up pretty good....I opened it up and found that the plastic tab that attaches to the metal base of the tray in holes depending on paper size, is missing. I don't want to buy a whole other tray just for this small part. Anybody have one, or know where I can buy one on the internet?