I removed the 2 crisper drawers and the glass shelf directly above the Pantry Drawer. Removed the Pantry Drawer and Pantry Drawer cover so you have easy access to the Right-Hand End Cap. On the right-hand End Cap, there are 2 screws which hold the End Cap in place, use a 1/4 inch driver to unscrew the screws from the front of the cabinet on the End Cap and half-way in of the cabinet, leave the screws in their holes in the End Cap. Lift gently to get off a small plastic pin, and move the End Cap away from the Cabinet. You don't need to completely pull the End Cap out of the cabinet, it'll move more like a door opening. Place 2 washers on each screw and gently put the End Cap back into place, being careful NOT to jostle too much so the washers don't fall off the screws. You will need to gently lift the End Cap back in to place over the plastic pin. Hand-tighten the screws back into place with the 1/4 in driver. Remount the Pantry Drawer on the sliders. When you go to install the Pantry Drawer Cover, you will need to gently push on one of the pins to get the cover back into place. Put glass and crisper drawers back into place.
Test by gently pulling on the Pantry Drawer. If properly mounted, the pins will extend fully into the Cover and will keep it secure when opening the Pantry Drawer.
