I posted this tip in one of the other sections of the forum, but thought I'd put it here in case anyone is interrested. When installing Kaddee #5 couplers on a car, I have found that keeping the box together with the spring and coupler in place, and then putting a #2-56 screw through the whole thing can be a bit unwieldy. If I have to take the box back off to add a shim for coupler height adjustment, it gets worse. what I do is assemble the coupler in the box with the spring and cover, put a long #2-56 screw through the box with a flat washer on each side and put a nut on the other side to hold it all together. Once it is assembled and held together, I glue the cover to the box carefullly and sparingly around the edges with liquid plastic cement of choice. I use Testors, but any liquid cement will work. Once the glue has set up, I cut off the "ears" from the box, and remove the nut and screw. Now I have a one piece assembly that is easy to screw to the bottom of a freight or passenger car, and easily removed if shims are needed.